Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac1a449ffac1f39…

MALICIOUS

PDF

75.8 KB Created: 2021-01-21 02:59:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c8543dbd39d73068e0b72fc2380f7a5e SHA-1: 88356895a8888cfc01ba0457908b7ed6effcf706 SHA-256: dac1a449ffac1f39027694be978eeee6b741fc264ca3e455eac22ff6714da4c9
184 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body, though heavily obfuscated, contains references to 'No man's sky best ship coordinates' and application metadata, suggesting a lure to attract clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=no+man%2527s+sky+best+ship+coordinates In PDF document text
    • https://dojufewuwi.weebly.com/uploads/1/3/4/2/134235401/vetidovesogiwod.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/niwujiropipadoworo.pdfIn PDF document text
    • https://site-1172263.mozfiles.com/files/1172263/the_last_door_collector_s_edition_free_download.pdfIn PDF document text
    • https://site-1207189.mozfiles.com/files/1207189/vufilokug.pdfIn PDF document text
    • http://fegebekuxew.22web.org/24608081358.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/dazom-kutaboviwozene-kuvowamizurifun.pdfIn PDF document text
    • https://site-1255715.mozfiles.com/files/1255715/64847705369.pdfIn PDF document text
    • http://jibiduseg.22web.org/formative_assessment_examples_in_primary_school.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473654/normal_5fb5f88ed6c56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/old_firefox_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/mercado_internacional_definicion.pdfIn PDF document text
    • http://gofudawaropuz.epizy.com/44088419661.pdfIn PDF document text
    • http://robogotut.epizy.com/wedujabigepizemuxefazafek.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/woriragukuragilidotewa.pdfIn PDF document text
    • http://buguwotibiven.rf.gd/history_of_architecture_byzantine.pdfIn PDF document text
    • http://xilibosukotijob.epizy.com/botany_notes_for_upsc.pdfIn PDF document text
    • http://kalogoraretupo.epizy.com/cell_structure_and_function_part_2_answers.pdfIn PDF document text
    • http://gugamofizuxeg.epizy.com/blu_ray_movies_hollywood.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 5592 bytes
SHA-256: ff8d718e2ce34babc2fc39cf31a7d0343bbba847d87feb4ba5a26c8892e2820f
font_01_sfnt_off0000fe91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 10348 bytes
SHA-256: a00a90f314189e803e3673b5dc8cda450b1f41b2f2f0d8a63d6aed09949b533a

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