Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c321727fca1f955…

MALICIOUS

PDF

69.7 KB Created: 2021-01-18 18:03:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: b75143559bf59a3b8ae649fc453035c2 SHA-1: 54a96f73c7a50e31805ce5d189b099b29b3d59c8 SHA-256: 5c321727fca1f955c2bd57c861f0c2bfc8f311a075eb6d033ff63e219012a48f
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/wb?keyword=9%20months%2014%20days%20in%20weeks In PDF document text
    • http://gutemelav.22web.org/fojamaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474471/normal_5fc517e9a1bb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496005/normal_5fb50f13d8646.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490547/normal_5ff4f50af16d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380867/normal_5febe5289aac5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408976/normal_5f96e97f48134.pdfIn PDF document text
    • http://tepuragebu.iblogger.org/cartoon_love_couple_hd_wallpaper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412183/normal_5f9f05d57d354.pdfIn PDF document text
    • https://bepupigo.weebly.com/uploads/1/3/4/3/134317889/gananatofakuma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416143/normal_5fe7870f2612c.pdfIn PDF document text
    • https://filuloxi.weebly.com/uploads/1/3/2/7/132740414/2347477.pdfIn PDF document text
    • https://lowijagaji.weebly.com/uploads/1/3/4/3/134394878/tusuwu.pdfIn PDF document text
    • https://metiledozixav.weebly.com/uploads/1/3/1/1/131164016/43b4aca4da.pdfIn PDF document text
    • https://site-1178860.mozfiles.com/files/1178860/5863285747.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sivojosifa.epizy.com/food_standards_allergen_sheets.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_off0000d403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD403 5396 bytes
SHA-256: f5aac20f84b0f81e56ea098e0edc6c17edbe7cec1bb9c4886c80a1b63f8e65aa
font_01_sfnt_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 10484 bytes
SHA-256: d56209241ab95446cf63afca61d05a01b91c0d0706de9d13852838c38c3ab779

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