Malicious PDF — malware analysis report

Static analysis result for SHA-256 774393a6508d02ed…

MALICIOUS

PDF

82.8 KB Created: 2021-05-28 19:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6e513d45898191635d377b966457125c SHA-1: b6225ce9c34cdc92a20170c6ba92e0083de3fed7 SHA-256: 774393a6508d02ed0e6fffceda595bedee6764fdc806feba46c6e8f99f77a31d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers indicate malicious content, specifically identified as a phishing trojan. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=what+is+the+average+price+for+a+cavapoo+puppy PDF link annotation
    • https://midinomuxew.weebly.com/uploads/1/3/5/3/135391973/7050307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410201/normal_601ee3f072dd6.pdfIn PDF document text
    • https://paxutujuwibe.weebly.com/uploads/1/3/4/9/134904532/3bb08d65691adbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473035/normal_6030371d47925.pdfIn PDF document text
    • https://keziraxese.weebly.com/uploads/1/3/4/5/134576249/5627523.pdfIn PDF document text
    • https://joxoxego.weebly.com/uploads/1/3/4/6/134664344/mezudegika.pdfIn PDF document text
    • https://ramabubutimelu.weebly.com/uploads/1/3/4/5/134597411/sojeragofa-wugatosibe-dapam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410678/normal_601736d48ce70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387920/normal_5fdebc5862e6a.pdfIn PDF document text
    • https://vusuneroroloxik.weebly.com/uploads/1/3/4/0/134096702/111512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_601fa88897721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384482/normal_6047cfc2ef4b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414357/normal_6007565f0c14c.pdfIn PDF document text
    • https://vizazoxo.weebly.com/uploads/1/3/4/6/134600102/9535675.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/eaabf20b-3160-4708-b180-b3d99afdcf3e/best_planners_for_2021_college.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac2d8d1-5768-4460-abd1-ae673073c9ea/the_devotion_of_suspect_x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08564143-5a9c-4242-9c16-5fe95b77aea5/wixolugazajusosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/211baaaf-d460-4717-9603-913db3846415/18484225735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/890e9ac7-8d13-44b7-a680-bb4d3e5f4f91/slader_big_ideas_math_algebra_1_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc771258-e63d-4083-b123-a75b1c4c50e4/vijigabiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ebd327-f12b-4599-a1e7-f8586f78fbcf/why_is_my_hamilton_beach_flexbrew_saying_needle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33a71777-b272-4618-b366-47fc031aa986/seth_klarman_baupost_group.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0cf7b81-9861-48d0-b30f-5d581132b76a/sapuduboxem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49fe196e-f85b-4355-b4fa-37231dc81217/how_to_clear_codes_on_onan_generator.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_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 5420 bytes
SHA-256: f8db0087cb59de275a498cb73b9d2303d369bf1e378eb411144abd8d278a1287
font_01_sfnt_off00011749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11749 11316 bytes
SHA-256: 3e90e30db683226ea457253f621de315d1343c68f5d7768765d6abaec12ab8f9