Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f72431f080fc0c6…

MALICIOUS

PDF

79.8 KB Created: 2021-03-24 11:06:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5ca630b72fd780853b52be7ced7a87fe SHA-1: b0c82c15bd84b0b49ba9600fb165ce8089c7d493 SHA-256: 8f72431f080fc0c6929ec717a16dd045fc2f2ccae9d041951ee19f3f45fbe309
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, suggesting a link farm or redirection mechanism to host malicious content. The document body, though heavily obfuscated, contains keywords related to free PDF downloads, reinforcing the lure.

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://pelibifir.ru/award?keyword=usgs+topo+maps+online+free+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421934/normal_5feb996849b90.pdfIn PDF document text
    • https://junobinedutuki.weebly.com/uploads/1/3/2/7/132712306/511e1f494730b.pdfIn PDF document text
    • https://zuduloto.weebly.com/uploads/1/3/4/6/134623707/sodejibomoxezeti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487622/normal_5ffba5e81eb2f.pdfIn PDF document text
    • https://siroxaje.weebly.com/uploads/1/3/4/0/134000026/aa56022c8.pdfIn PDF document text
    • http://baugroup.info/caida_de_constantinoplaodr69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385235/normal_5fee7b6a0ed73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529780/normal_5fe365bc8c2f2.pdfIn PDF document text
    • https://toguvavi.weebly.com/uploads/1/3/1/3/131381044/5369299.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412181/normal_5fee40d0b1a9f.pdfIn PDF document text
    • http://iranianvc.com/gafasogudow82pl0.pdfIn PDF document text
    • https://tejiwubatimi.weebly.com/uploads/1/3/4/8/134899102/gopigexaboju_kusizazara_fakutoxa_gomiwekedokiv.pdfIn PDF document text
    • https://jitivafume.weebly.com/uploads/1/3/0/9/130969372/a176b030d.pdfIn PDF document text
    • https://pigulanofalo.weebly.com/uploads/1/3/1/4/131406379/1037284.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/suterakab_pavawelowes_pozujisezij_mupekololixaji.pdfIn PDF document text
    • http://stixlife.info/momuputajifepojesofisnhtm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_b3181d92c1e04547a61f64155ddbcae7.pdf?index=trueIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_d22f0a486fc1442982daf8f52ab4377a.pdf?index=trueIn 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_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 5352 bytes
SHA-256: dc1b10e8a2171f489577b766bd319ad860a317c2801213821f781c31342b6f5a
font_01_sfnt_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 11400 bytes
SHA-256: e239a4cd8d1945f36f6ecb463f2a9924958757258e217af64d3f086a90f58f0b

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