Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b67f70bd5d9bdf…

MALICIOUS

PDF

71.8 KB Created: 2021-04-30 06:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2c0990d0e1df989e6e4dbfb936737936 SHA-1: c93e02aa63b410f3ea9f0241fea61382e593cbf7 SHA-256: 54b67f70bd5d9bdf6a0a17ed66198281d75665cf45f719b7c3aef1c07d24c441
186 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 0.9998

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
  • 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.
  • 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://vilenefex.ru/strik?utm_term=prwora+fact+sheet PDF link annotation
    • http://arfeshome.com/jalonitexegofokafxhv41.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/hjp7Jjb/rulepaje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527164/normal_601cb22dd7657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477373/normal_601bfa6122624.pdfIn PDF document text
    • https://sirunolova.weebly.com/uploads/1/3/5/3/135303996/4950269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_60584422080cf.pdfIn PDF document text
    • https://xadajosawot.weebly.com/uploads/1/3/1/6/131636584/835572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389570/normal_605db66f5c30d.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/hheiiHD/1950802494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407070/normal_604fd33a18a20.pdfIn PDF document text
    • http://reduslimitalia-official.website/47192541023guq4i.pdfIn PDF document text
    • https://tagojakiwuki.weebly.com/uploads/1/3/4/4/134444274/f0ad2fd.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/b5ae13ac7fb.pdfIn PDF document text
    • https://pigokujedaxe.weebly.com/uploads/1/3/0/7/130740563/54a4385f.pdfIn PDF document text
    • https://cdn.sqhk.co/xugumewaz/hix5jij/dalijemejerisilarebefove.pdfIn PDF document text
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/2570944.pdfIn PDF document text
    • https://fewarixavaj.weebly.com/uploads/1/3/4/8/134847043/bd754291891.pdfIn PDF document text
    • https://cdn.sqhk.co/sadinuko/jhcIsgc/43193822117.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_off0000ded5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED5 5028 bytes
SHA-256: a6bc5fedde146b101ebf4d7bdb99f0d2f1f1df39da8d0013d49f88c35fdf8130
font_01_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 10128 bytes
SHA-256: 146ce54b14605048d9331be635acde488a7eda561e59afe53626981c4521821e

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