Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada5ea41e21d3797…

MALICIOUS

PDF

79.7 KB Created: 2021-02-09 05:01:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: eefd1836546b33a28187fbc1bb520ca7 SHA-1: e532918a6a231de869e6928806c7aae094ca0efb SHA-256: ada5ea41e21d3797a550cf014b286eb1b2be5c71f6d4d2ef616b37ac5e3342c9
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 numerous external links, a common technique for SEO link farms or distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URIs and the overall structure suggest the document is designed to redirect users to potentially harmful websites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/123?utm_term=language+families+definition+ap+human+geography PDF link annotation
    • https://cdn.sqhk.co/zusisoko/hN6OghL/jakajexowefaj.pdfIn PDF document text
    • https://xarupome.weebly.com/uploads/1/3/4/4/134469096/xuzizeluriji.pdfIn PDF document text
    • https://dubobovutorikug.weebly.com/uploads/1/3/5/3/135332124/bepukaj-redizejapovuzit-zumiweziwon-fozarafemoli.pdfIn PDF document text
    • https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/dugidexuzeguto-tifafubo.pdfIn PDF document text
    • https://madajeguruxe.weebly.com/uploads/1/3/4/3/134348767/7728219.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/4779538.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413231/normal_5fe2091dd1423.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451555/normal_5fcef8bd2325b.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/fadedosi/bifaf.pdfIn PDF document text
    • http://bepenaguvofiw.epizy.com/meboduvutezuror.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/atp_adp_energy_cycle_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/kurejo.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/94435987914.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/87050679869.pdfIn PDF document text
    • http://walogoke.epizy.com/82828355783.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/beehive_bedlam_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/59392973810.pdfIn PDF document text
    • http://wijexaxowakovan.rf.gd/invite_to_event_email_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_off0000f88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 5496 bytes
SHA-256: c9714319d76e423bd110787d210566eaa7e3d372037b19f188341498321d2bc3
font_01_sfnt_off00010b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B28 11164 bytes
SHA-256: c60e21a95e582226275f4336149ea5e946309918b277de1eb8876fb59a711144

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