Malicious PDF — malware analysis report

Static analysis result for SHA-256 779e45868540343b…

MALICIOUS

PDF

72.0 KB Created: 2021-01-19 05:17:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0f5f3cedde19081acec6aab994c47c87 SHA-1: baf4e9b553ce59b05231095a5267a4c186359435 SHA-256: 779e45868540343be2ca46a51bfd2891b9f7f21f62a3c0275d7d043486daad2f
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to external websites, including known malicious redirectors like 'ggtraff.ru'. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but no direct instructions or lures are discernible from the readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://ggtraff.ru/123?utm_term=kid+korral+kh3 In PDF document text
    • https://xegubivagemegi.weebly.com/uploads/1/3/4/4/134481439/ecfdf506936e6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388285/normal_5fa812d6ef468.pdfIn PDF document text
    • https://site-1195605.mozfiles.com/files/1195605/wevodowesikaxo.pdfIn PDF document text
    • https://suxuwimuwudex.weebly.com/uploads/1/3/4/6/134641155/9402087.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/jenutekegamaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483097/normal_5ff37dca03e92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379487/normal_5f97c6cec765f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450151/normal_5fedad70c2a4a.pdfIn PDF document text
    • https://jilibawijoza.weebly.com/uploads/1/3/4/3/134363321/xutubevenozaxerom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372074/normal_5fb87086ef98b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416322/normal_5fdbaec7ee326.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417662/normal_5fe57db604b68.pdfIn PDF document text
    • https://site-1176076.mozfiles.com/files/1176076/dhaka_university_admission_test_question_paper.pdfIn PDF document text
    • https://romuxejis.weebly.com/uploads/1/3/4/8/134887308/guwopu.pdfIn PDF document text
    • https://site-1167971.mozfiles.com/files/1167971/araba_oyunu_indir_apk_day.pdfIn PDF document text
    • https://site-1168003.mozfiles.com/files/1168003/79059434108.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD247 4416 bytes
SHA-256: db46e14fe1b739d25352c546a628764d5272e3a2171e306665cb5dfa5ae4e213
font_01_sfnt_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 10596 bytes
SHA-256: 65c44232f6d24ab97c865a812bcd0478ff8141726824885a2afa06c63aca4102
font_02_sfnt_off00010550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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