Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fdf1701744bd940…

MALICIOUS

PDF

82.3 KB Created: 2021-02-22 16:06:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 330ed263e92cc4695296a1fc9b6a18f4 SHA-1: dbaef4df03cac672f47fb5056fbedb02d4ae9baf SHA-256: 6fdf1701744bd940df9ba1f367811e8280080474212ee5c3591a31716157d8dd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. The heuristic PDF_SEO_LINK_FARM indicates the presence of a mass external PDF link farm, with one such link being https://static.s123-cdn-static.com/uploads/4409623/normal_5ffa5b74c6f01.pdf. The document body contains a query about printer scanning, likely a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://leonvi.ru/123?utm_term=why+won%2527t+my+hp+officejet+pro+8600+scan PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409623/normal_5ffa5b74c6f01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482027/normal_6005afe3d32e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448545/normal_602e614c2b02f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495855/normal_5ff59be50bb15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458150/normal_5fe68b499a4bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453550/normal_603335bc2c70a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481058/normal_5fe38d32aabcb.pdfIn PDF document text
    • https://zedifetizigofup.weebly.com/uploads/1/3/5/3/135393349/valobumapif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478933/normal_6031f687d00a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468820/normal_5fd819c408a41.pdfIn PDF document text
    • http://tubezadobuzaro.66ghz.com/free_business_card_mockup_psd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390056/normal_5fee0e4c31620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465125/normal_601ad61eded09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426822/normal_5fe0168670f30.pdfIn PDF document text
    • https://dijafujuzu.weebly.com/uploads/1/3/4/3/134369935/rudaparasemu.pdfIn PDF document text
    • https://xunasumip.weebly.com/uploads/1/3/2/6/132696393/7997576.pdfIn PDF document text
    • https://pusetuliv.weebly.com/uploads/1/3/1/6/131607438/3271574.pdfIn PDF document text
    • http://www.typoland.com/http://www.typoland.com/designers/Lukasz_Dziedzic/CopyrightIn PDF document text
    • http://www.typoland.com/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tatetutigu.rf.gd/86387840409.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/what_happened_in_america_between_1800_and_1850.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/31294391381.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 6168 bytes
SHA-256: 9f07a400e75c177e496f395344003d4a7545e118b36bf59d530d47f9bb3550f8
font_01_sfnt_off00010135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10135 6028 bytes
SHA-256: fed5c1e08e32964bb7e43d76dce4687b167885cf73c4924a55ee0e8569be17fc
font_02_sfnt_off000115ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BA 10928 bytes
SHA-256: 27a1a3ba5a2bd8f48f5a69a2b4f628af311a3c9800015c34119583bda1213fa9

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