Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28fb092d057e7fd…

MALICIOUS

PDF

127.2 KB Created: 2021-06-09 00:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a36a2bf68e6716f7e875ccde94bddad2 SHA-1: 543b28f8385f3274a1373e0ac3f4f3862fb7810a SHA-256: f28fb092d057e7fd966947e4ffc786e8b78bcc76ea26a29875470e08fe76b755
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, identified as a link farm, with a specific lure related to game save data. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious sites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/pbw?utm_term=dragon+ball+z+tenkaichi+tag+team+ppsspp+save+data PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459481/normal_6068bb7145bc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370737/normal_5fcbb79c0a64c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_601950a3cccf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366024/normal_6017beedc800c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496853/normal_602072a82038f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453719/normal_6042c970b3589.pdfIn PDF document text
    • https://dofewomal.weebly.com/uploads/1/3/4/5/134510420/8522436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481422/normal_605ddd7933206.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459318/normal_5fe1bae1b1961.pdfIn PDF document text
    • https://logosomuzabi.weebly.com/uploads/1/3/0/9/130969340/voxuwozijokajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491688/normal_603bcbcd74e50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413567/normal_5fe5eaf2c1f7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404310/normal_603bebc7835bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402262/normal_605f9d27a8a47.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/835920cc-605d-4dc4-8235-c07f2a976688/vogixamegas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/862c2c18-7581-44f3-97da-5893a2efc2a5/rinedezudunujagukarojo.pdfIn PDF document text
    • http://laxujaju.pbworks.com/f/how_to_get_a_loan_with_delinquency_on_credit_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55f7680f-80f2-4472-aabc-a316a8274c67/mofatizape.pdfIn PDF document text
    • http://ririgifavem.pbworks.com/w/file/fetch/144744525/balanced_diet_chart_for_all_age_groups.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/11677720012.pdfIn PDF document text
    • http://felefejimax.pbworks.com/f/are_blends_and_digraphs_the_same.pdfIn PDF document text
    • http://mituxap.pbworks.com/w/file/fetch/144661002/spanish_ar_er_ir_verb_endings_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32f3bffe-c55f-4c3e-93d2-f45db28bcd9e/22185296703.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001649e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1649E 5800 bytes
SHA-256: 50a41790b490b5be2ca101892eec0c49a4b328ec61312d2f91e15be9b726311e
font_01_sfnt_off00017836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17836 6824 bytes
SHA-256: a7b22be0a77dcc9e4997cfd8015d94072c4c2966e7a912461c7d5ece6b83819e
font_02_sfnt_off00019053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19053 11820 bytes
SHA-256: f23d23f559d1dfc84c1c386b92d9197c2b7338babfe97f0e45f2bb4439ad44b6
font_03_sfnt_off0001b868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B868 18084 bytes
SHA-256: 63592e6db608602b297e8be2eeb8218c808a31a1939e9a6b5f5f7623d65253fd
font_04_sfnt_off0001d380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D380 1736 bytes
SHA-256: 551918360585b1590efa6fd2a215345b2f702067d151a0e4b48cfa7490b57960
font_05_sfnt_off0001dac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAC5 6536 bytes
SHA-256: 6f54a19e27f2efb045f4b91751965de10910c42b1a8ad35b1c1fea24708041c9

Open this report in the interactive analyzer, or submit your own file for analysis.