Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2d176f27568c6c…

MALICIOUS

PDF

77.7 KB Created: 2021-05-20 11:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f27b23ab2e879da2aea6ac8514700871 SHA-1: 165274aac4cb4efb1c16ef3ea4ecd5a7103486b7 SHA-256: fb2d176f27568c6c7c4e7ec3a4ffbb4c1170f640c033c9ea6398343c4689b172
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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://jottigo.ru/strik?utm_term=poems+on+new+beginnings PDF link annotation
    • https://budojidotepaso.weebly.com/uploads/1/3/5/3/135312143/42411.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475571/normal_5ff75e69e7b94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_602fa5e39dd23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383314/normal_6012320dc5509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414495/normal_6026188564d64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424328/normal_6055234030ed7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467298/normal_5fd85c9b80755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413368/normal_601cbc7d3d3a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_606e1fc09a38b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422893/normal_6065761e481ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417527/normal_5fe3ee0493fab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387566/normal_5feb5a8d48709.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460694/normal_5fed451a910e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451575/normal_6036852d01a62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391620/normal_606ad61e69d6f.pdfIn PDF document text
    • https://befuvabesuwab.weebly.com/uploads/1/3/0/7/130740391/xububiviloresabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481056/normal_6052b3b7cc202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496607/normal_605d669676ac7.pdfIn PDF document text
    • https://tasitonedilegu.weebly.com/uploads/1/3/5/3/135301248/f92e19dee3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452612/normal_601f9a9ab3c22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497370/normal_603f35d74eefe.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_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 4900 bytes
SHA-256: 7abf43d61335b61eb0db497cb6fad605ea10651df45a48f494f63ac253e161cd
font_01_sfnt_off000104b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B1 10856 bytes
SHA-256: f97f48ed3cf49fe79ee698d87f1fc1c434c2910667209cc95470a5bc7c687db5

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