Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbc69f03dc9f01d…

MALICIOUS

PDF

70.9 KB Created: 2021-01-14 19:36:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 07091a743b4681342ba094b0e5e0e03b SHA-1: d57d3db7be969a2190ffafe71ec24efdb5f05ff9 SHA-256: 0fbc69f03dc9f01d018371baa70e63e83b863aa59e44dd7e728beedffca9e901
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to malicious content.

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://traffset.ru/123?utm_term=lsu+alabama+stream+buffstream PDF link annotation
    • https://zuwasaroniw.weebly.com/uploads/1/3/1/3/131380739/7b7975f780e6.pdfIn PDF document text
    • https://site-1173734.mozfiles.com/files/1173734/jovedabapaporopeg.pdfIn PDF document text
    • https://site-1234079.mozfiles.com/files/1234079/65628306143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403428/normal_5f9a896b1ad19.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/livemarovepari-novuju.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/15a30b0ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380527/normal_5ff0df41b1413.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/86699895388.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/annabelle_s_homework.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/hot_air_balloon_colouring_template.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_off0000d86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 4992 bytes
SHA-256: a1a6d3c4f86494ae75517481e30623bcd45a9c1d382981a07c91a527aafeeea1
font_01_sfnt_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 11260 bytes
SHA-256: 6721e8c7daf10b04e10b7e58270827d84071d899963db0aa29410c5a1cb523ea

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