Malicious PDF — malware analysis report

Static analysis result for SHA-256 433b738c021836c4…

MALICIOUS

PDF

74.7 KB Created: 2021-01-10 11:13:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5cd9223e72279bf84aaffbc02de987ed SHA-1: b771e9866d70ed38a40017249bde101aefaaf55e SHA-256: 433b738c021836c42018a0e4f11f9d3c5fb3e4cafe8c369e18ed21799b7b855c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://trafffi.ru/123?utm_term=tangential+speed+calculator+omni PDF link annotation
    • https://tirasuvemesamu.weebly.com/uploads/1/3/4/6/134672388/figasovutobuvuto.pdfIn PDF document text
    • https://zitobejamowimuk.weebly.com/uploads/1/3/4/6/134623616/gipikukojotavupa.pdfIn PDF document text
    • https://wozofawado.weebly.com/uploads/1/3/0/8/130874325/5813006.pdfIn PDF document text
    • https://bomoturu.weebly.com/uploads/1/3/1/3/131384468/3787564.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367650/normal_5fce99b90dd91.pdfIn PDF document text
    • https://fisolaxarod.weebly.com/uploads/1/3/4/4/134471724/rusobagap.pdfIn PDF document text
    • https://pasifoberili.weebly.com/uploads/1/3/4/8/134881239/1795249.pdfIn PDF document text
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/2919154.pdfIn PDF document text
    • https://fafevidelaxikez.weebly.com/uploads/1/3/4/4/134481631/sigukaz-wusekigog-lofuradijeleb.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
    • https://s3.amazonaws.com/zinudipir/83324594292.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/susaremeliritesujevamiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/ganesh_atharvashirsha_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/english_to_russian_translation_skills_test_answers.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_off0000d55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55C 5224 bytes
SHA-256: 4822c7bff6f4bd611473b4e4894d0c67a0139e07adc4cebefabe7991f799f37b
font_01_sfnt_off0000e6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FD 11580 bytes
SHA-256: 9885c8d545a38b9079892c8629ac61da1589c7c1925ae7ad7ab533b59fe17881
font_02_sfnt_off00010e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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