Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd921ba347e35ca5…

MALICIOUS

PDF

67.9 KB Created: 2021-02-23 00:36:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 546602462efe58eeb9836b640256cc46 SHA-1: 14f1b719cd30caa330116a40d022823bcfdc71b5 SHA-256: cd921ba347e35ca54098c868ec9f29d7ef3267502f45c6b878e5920545d955dc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with the primary URL being 'https://baarspo.ru/wix?keyword=sap+batch+management+configuration'. This suggests a phishing or SEO poisoning attack designed to redirect users to malicious content or facilitate further compromise. The ClamAV detection and ML classifier further support its malicious nature.

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 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://baarspo.ru/wix?keyword=sap+batch+management+configuration PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371248/normal_5fef53146c098.pdfIn PDF document text
    • https://fazerirusabutef.weebly.com/uploads/1/3/1/3/131381144/bf805e580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418584/normal_6002757db963d.pdfIn PDF document text
    • https://pojamemurix.weebly.com/uploads/1/3/1/4/131408024/zefidulo-tusivuweseb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417658/normal_600096d2989cd.pdfIn PDF document text
    • https://fogoranamixite.weebly.com/uploads/1/3/5/3/135390362/tuvejinuxovilagi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_6019b9c3715d1.pdfIn PDF document text
    • https://jabibodusap.weebly.com/uploads/1/3/2/6/132681053/5034337.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/gazuge.pdfIn PDF document text
    • https://jikodidujur.weebly.com/uploads/1/3/5/3/135319234/a7bcbe6c26c.pdfIn PDF document text
    • https://zaxusivu.weebly.com/uploads/1/3/5/3/135393217/bifomugelomowa_pirogutokub_finelomeguladok_rumolal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463266/normal_5fcb9e3a1f135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403428/normal_600b2ebcef2d1.pdfIn PDF document text
    • https://foderojev.weebly.com/uploads/1/3/4/0/134041652/1545000.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490001/normal_5fcb684a45584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_601cb766d484e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD65 5460 bytes
SHA-256: 9b4c4ad1cbb5dd0dbd1ba245bb582bc6322dbef99a325b4704cd74f2c01ecb75
font_01_sfnt_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 10196 bytes
SHA-256: 9e9d59d1f56024df7cab4a18ef352f21f2a246a6f611977d1682ef3288bc0a37

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