Malicious PDF — malware analysis report

Static analysis result for SHA-256 071ed187e071d584…

MALICIOUS

PDF

85.2 KB Created: 2021-06-05 15:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 58a7282e726f8e994e86ba11ba8e4dc9 SHA-1: 3f38ac5aeb8a5531f241b36450b8d3862acf11aa SHA-256: 071ed187e071d5849d02e8c9263fcc5e89cf65c0802e56215a1f10c5fb020124
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=how+to+add+more+writing+on+instagram+bio PDF link annotation
    • https://dopatojibeforu.weebly.com/uploads/1/3/0/9/130969701/gitobed.pdfIn PDF document text
    • https://puxetesotomu.weebly.com/uploads/1/3/0/7/130739839/gijuxi.pdfIn PDF document text
    • https://zazewefagawi.weebly.com/uploads/1/3/0/7/130776698/buped.pdfIn PDF document text
    • https://sawuwirepugasup.weebly.com/uploads/1/3/0/9/130969548/neluwenukinuji.pdfIn PDF document text
    • https://zukixemafeka.weebly.com/uploads/1/3/1/3/131398149/texetigidef-nevozodawow.pdfIn PDF document text
    • https://misekijenag.weebly.com/uploads/1/3/1/3/131380320/befodikozu_rugajowevugij.pdfIn PDF document text
    • https://vebagikag.weebly.com/uploads/1/3/4/5/134522288/76a9bec74a1.pdfIn PDF document text
    • https://kosukanawator.weebly.com/uploads/1/3/5/3/135304621/nogafuwiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nafidob.pbworks.com/w/file/fetch/144620595/how_to_download_microsoft_store_on_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c43d0e07-def9-4fd2-9471-8c338b6c6bac/77314249522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b97dac9-8a83-430b-bc89-e59c17f15dd5/do_you_capitalize_season_with_year.pdfIn PDF document text
    • http://kirozatijawu.pbworks.com/f/fatalities_mortal_kombat_vs_dc_universe_ps3_sub_zero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bbecf87-c07a-4141-8999-b073fad2c55c/samsung_galaxy_s4_mini_gt-i9192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d88f7c5-f285-41f1-8214-c56677fd8996/xosamozigotukejunetibelaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10d19df0-79db-4ee7-8671-681a6c45c4a9/netbeans_8.2_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23cbe25c-20aa-4ecf-9b73-79ec0820a6a2/how_to_make_easy_slime_at_home_without_glue.pdfIn PDF document text
    • http://gisugakeg.pbworks.com/w/file/fetch/144652179/72722586526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ffc586-3813-49b3-b135-cda8089bc456/kinoviwupum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fca3876f-43f8-45e5-aaed-04f12b72afd9/21626344404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ecf904-09a3-4c8d-9ff7-40a15119d60e/33070907665.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
    • 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
    • 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE749 6744 bytes
SHA-256: 8187145963fbf8e0b7977f93bb9cbfc296fb812f6e2b6f40a3c8d31ca5a797a4
font_01_sfnt_off0000f830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF830 5308 bytes
SHA-256: cc0bf3468f11a15a535988f58052239a3ad2dbfae028091fdcd88e9e319fec74
font_02_sfnt_off00010a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A33 11984 bytes
SHA-256: bf1019891e6467da0d68131c20294ad161aeab2d2bfcf60024d10d85941711b5
font_03_sfnt_off000131be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BE 16060 bytes
SHA-256: 9fce2e558c7eba93e9b4ba87b790c422cf9490aab73fe875614431ac3e7f116a

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