Malicious PDF — malware analysis report

Static analysis result for SHA-256 b036a73a6c99177c…

MALICIOUS

PDF

74.4 KB Created: 2021-03-05 04:31:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7a122e475f6fdee5ae0b204ae4427c0c SHA-1: 264495b32fb380fc2155e163533b3b22dbe72f9f SHA-256: b036a73a6c99177c1139fc92f6a0b9b62c9d53202965318c116ab02f8a272c3e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDFs, likely for SEO manipulation or to distribute further payloads. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest this document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/aws?utm_term=difference+between+form+and+space PDF link annotation
    • http://delaem-sami.online/chess_strategy_for_beginners_magnus_templarzwgcy.pdfIn PDF document text
    • http://potolkilife.ru/28740405922w6y52.pdfIn PDF document text
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/2e8e18e1d9.pdfIn PDF document text
    • http://supportcopyright.net/cetoacidosis_diabetica_fisiopatologia_pediatria9d2w0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498392/normal_602e0e9d3400a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454045/normal_5ffbbc41d1989.pdfIn PDF document text
    • http://vvinorama.website/onelogin_protect_downloadweslc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480755/normal_6031cec89a6d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_60381213143f7.pdfIn PDF document text
    • http://nijaxubazaziw.mypressonline.com/69225445717.pdfIn PDF document text
    • https://pogudemuzam.weebly.com/uploads/1/3/4/0/134018755/bc1f0a3f4e1c47.pdfIn PDF document text
    • https://wutarodopa.weebly.com/uploads/1/3/4/2/134266687/mazubilojibedogisobo.pdfIn PDF document text
    • https://sepiboberad.weebly.com/uploads/1/3/1/1/131164555/209151.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/d5e49495f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445106/normal_6020cd279294d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_9a8547b127ce4c2a87e2695e5c597a9b.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_dcbf80a4bcde49ddafe6936b3ddbd5b5.pdf?index=trueIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_bb10072af82d48f0a2f7c2cefd892c32.pdf?index=trueIn PDF document text
    • http://wadoromutisagar.myartsonline.com/luxatonomo.pdfIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_03c7bf166b4149ea993614da6faae30d.pdf?index=trueIn 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_off0000e363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 5500 bytes
SHA-256: f2935327834494c029478453d53f752d0fb3bd1c0acb5256c66811977a017906
font_01_sfnt_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 10728 bytes
SHA-256: b1dff5ac95e5a0aea5c154551d1cf9d7ee5bf0681c8a6c20afd2cd1be8245184

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