Malicious PDF — malware analysis report

Static analysis result for SHA-256 a297a40d3cfb6f82…

MALICIOUS

PDF

76.0 KB Created: 2021-02-12 15:51:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7e094f107dc31fd9a77d4e9e7999fbeb SHA-1: e56cb3369b3af0e672ea9cc0b26cd3effae67b3a SHA-256: a297a40d3cfb6f8203ee8256ae6b9ed79fb9304e35dcbfe0e327e92c49a7f585
186 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, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://baarspo.ru/123?utm_term=best+exercises+for+ac+joint+pain PDF link annotation
    • https://jotitotibewava.weebly.com/uploads/1/3/1/3/131383271/53fa557f64ee.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/0ac37cd8f4f.pdfIn PDF document text
    • http://idealica-uficialeitalia.website/73652172989l7qq7.pdfIn PDF document text
    • https://zubisixoligifi.weebly.com/uploads/1/3/4/4/134479514/f14feb72e6066e3.pdfIn PDF document text
    • http://jibifiva.22web.org/calculus_early_transcendentals_6th_edition_free.pdfIn PDF document text
    • https://bopunesarikimar.weebly.com/uploads/1/3/1/4/131453984/7181630.pdfIn PDF document text
    • http://ryursew.space/aha_cpr_guidelines_2018x2uw0.pdfIn PDF document text
    • https://guvijubeb.weebly.com/uploads/1/3/5/3/135318684/kavorodopuwu.pdfIn PDF document text
    • https://vomuzubedabop.weebly.com/uploads/1/3/0/9/130969103/895020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371005/normal_5fef653d90894.pdfIn PDF document text
    • https://lojapajarete.weebly.com/uploads/1/3/4/5/134521209/70f6f3f5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417645/normal_600d23764d4ea.pdfIn PDF document text
    • https://viwoposiruxeduz.weebly.com/uploads/1/3/4/6/134633276/gifugu.pdfIn PDF document text
    • https://woziwapimarezex.weebly.com/uploads/1/3/5/4/135400795/zapejulopapogapar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gugevifuvonavir.epizy.com/62987042419.pdfIn PDF document text
    • http://wodasekewu.epizy.com/minecraft_enchanting_guide_1._13.pdfIn PDF document text
    • http://kigexozuzexozo.rf.gd/nujujafekames.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 4960 bytes
SHA-256: 5e272fe354d38f0ddc259c93ecafab8698ff64b595697225aaa8a00196a06c88
font_01_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 10156 bytes
SHA-256: 812ebbf28d91221c4211608a8a6ffdc846c1dba7ece021619bd85a18321a56d6
font_02_sfnt_off00011501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11501 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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