Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a935e0344ffea45…

MALICIOUS

PDF

76.1 KB Created: 2021-02-27 21:41:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c07107b37dec863b0a0b44ed9b3760db SHA-1: 98ace2f3fb143f5c8e93dba520ee84604143b374 SHA-256: 7a935e0344ffea45ed2a9872473432a74272536e87751ae4c6626b54497c4777
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://fokemale.ru/aws?utm_term=how+much+do+it+cost+to+buy+a+kit+houses PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413983/normal_600b8cd8ce5f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_601bc1bf7b2a7.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/65523395090.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/what_is_my_love_language_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446168/normal_600eed0cb3ee8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426832/normal_6024479127ee1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419433/normal_5fd6ac807f416.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/city_of_thieves_book_amazon.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/how_to_get_your_ex_back_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371265/normal_5fcbfe1c81e59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391326/normal_600b5ab8b05a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500438/normal_60012c5a17713.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fiforeru.atwebpages.com/mixefamirimaxepedene.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/22788036288.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/sepasoxigefe.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/diwawujovinemamupowamu.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/32125702113.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_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 5412 bytes
SHA-256: a5c6ab4bc9076c4b2439373d46f385e52f2b7add7e3b8a4955e7b6b496284ce0
font_01_sfnt_off0000fd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 11104 bytes
SHA-256: 0a3ea04ca273cb742a3c48bdeb80de98cbc4c749dab7f320893f7d49ff911074