Malicious PDF — malware analysis report

Static analysis result for SHA-256 278bdbb40da608b4…

MALICIOUS

PDF

78.3 KB Created: 2021-05-16 07:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1185ca6eb9b4bb2f435b76ef6b253b64 SHA-1: c2d006737c0dead2722ee9be2e7d8cbb5da8c028 SHA-256: 278bdbb40da608b4ba8c4c7c21b93b97933f6e23a1ba4a2b3dd99f66765abf89
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by the 'Browser extension / update installation lure' heuristic. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection further support its malicious nature. The document's primary function appears to be social engineering users into downloading or installing potentially harmful software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jacksth.ru/strik?utm_term=citizen+skyhawk+limited+edition+blue+angels PDF link annotation
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/1929602.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485435/normal_5ffd61369d059.pdfIn PDF document text
    • https://peninugeba.weebly.com/uploads/1/3/4/6/134666339/kamiwibizad.pdfIn PDF document text
    • http://hookup153.site/lotobidogap830wr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413705/normal_60418d490f1cd.pdfIn PDF document text
    • https://vaxovuxaso.weebly.com/uploads/1/3/3/9/133997441/nolovugawopizefunu.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/baguvuvuzebifuzuf.pdfIn PDF document text
    • https://pusosisuko.weebly.com/uploads/1/3/6/0/136094517/newexesogope-jusatuxomaga-mopatabesipeb-mijusu.pdfIn PDF document text
    • http://maddot.space/kotomowavebpful.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413590/normal_5ff8d7f5bc4af.pdfIn PDF document text
    • https://tewafegode.weebly.com/uploads/1/3/5/3/135350941/2077996.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_319919a0a3ea4900bde1ba546d3173ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e67912-9cfb-4353-9e22-ba6748f2fdc3/kemafufu.pdfIn PDF document text
    • http://litorow.myartsonline.com/craftsman_6.75_briggs_and_stratton_lawn_mower_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/643bcf3e-f565-4382-a2d7-0109073a7e7d/pevobalojut.pdfIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_92b979acedc349599bcf8ed6538e0e1d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f9fef7e-a5c8-40df-89f0-b984557178ea/the_god_code_review.pdfIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_69398a9f1ced4193bd92149202184509.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14723af4-940d-44d1-b069-d3d46476571d/wd_4tb_my_passport_ultra_for_mac_portable_hard_drive.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/rujisiw.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_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 5496 bytes
SHA-256: f1ac133804df244daf265875069d47c6cb3e485425b32d3f9a91ea430a9e72dd
font_01_sfnt_off00010646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10646 10872 bytes
SHA-256: 462f46c4492812f0b64cbdcbc9de8ae7df36345081b503fef21c2ae13f5069b1