Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5b8d9a997a5243…

MALICIOUS

PDF

79.8 KB Created: 2021-01-09 22:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ef83ec2ad37c931e65698b0380ac48c8 SHA-1: 7705e157530caf915a237f5fc3419140d97553d7 SHA-256: 1e5b8d9a997a5243d3a6b9f7c7f36c69cffe9481784bd9768f4d55cda0d6933c
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files hosted on various disposable domains, indicating a link farm. One of the primary links directs to a known malicious redirector. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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 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.
  • 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://gettraff.ru/aws?utm_term=brain+anatomy+3d+free In PDF document text
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/8ecc971b46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483335/normal_5fcfb2df3a52c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417531/normal_5f9591a7933b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368953/normal_5f87a667e3caa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f91d25a69c02.pdfIn PDF document text
    • https://goradexajegofip.weebly.com/uploads/1/3/0/8/130874122/genuwumivil.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/jdhdJij/run_third_party_apps_on_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/renapudovi/jNzZgiJ/34434239015.pdfIn PDF document text
    • https://gesoroserazam.weebly.com/uploads/1/3/4/3/134310447/5fc078b968c3c94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426676/normal_5fe1884a6a220.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/d500f38db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393181/normal_5f96d6ada2f2a.pdfIn PDF document text
    • https://bifixebuwo.weebly.com/uploads/1/3/0/7/130776276/fozitala.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379362/normal_5fc5955e50b26.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/bfiajbo/extreme_car_driving_simulator_mod_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465709/normal_5fb49f73cfd73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393506/normal_5fde915dbb23a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.orgThisIn 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://scripts.sil.org/In PDF document text
    • http://scripts.sil.org/OFLAbyssinicaIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD156 5156 bytes
SHA-256: 58d26929a05e5f48df0f15e2cd7c7a427fb53dad52bcd1a4152f19677fefe9cb
font_01_sfnt_off0000e2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D9 20848 bytes
SHA-256: 4ef1d9d53466d1daa6404430c5aaadf36c4aa2289b0077dd21aedc909987c405
font_02_sfnt_off00010299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10299 2120 bytes
SHA-256: 446de5d50713d8c4fb4cde9e762c10280d3ac92bb58c27ae6865d388bd283ddb
font_03_sfnt_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 11164 bytes
SHA-256: 74b46aaabf674d9703a4904026546f8045af74bfa4e2942688b8b9026198557a