Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1909a52d0c336c3…

MALICIOUS

PDF

69.6 KB Created: 2020-11-11 12:47:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 892acb8f6d0d369afcde905f05b66741 SHA-1: d6fd94a26323fe8923df7d81d96ba7bee881bc45 SHA-256: b1909a52d0c336c386f48ee4e3b2d7dae8ae4f12d3e8de579ec30b28d06ad585
156 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 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://trafffe.ru/123?keyword=fanuc+manual+guide+i+engraving PDF link annotation
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/7558281.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/3166c2c0ec97.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/28332.pdfIn PDF document text
    • https://gixapogaruxa.weebly.com/uploads/1/3/4/3/134331356/783946.pdfIn PDF document text
    • https://sakuvajavabese.weebly.com/uploads/1/3/1/3/131383602/c979fecb.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/dujepav/bullwhip_effect_example.pdfIn PDF document text
    • https://s3.amazonaws.com/vasagesorajirem/zatefosanakejiz.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/30730891560.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/ragnarok_archer_solo_leveling_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/e_magazine_legal.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/define_mitochondria_function_for_kids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea45c36f-94c9-48e3-89a4-fd80d1d1064c/sexubidukexoviv.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/lyrics_and_chords_to_wheels_of_laredo.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/adverb_clause_grammar.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/88501660474.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_off0000c595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC595 4788 bytes
SHA-256: b104aede0a5367979e7d37a13ac9351f370db7f4ae182577f87d414b4c5079e4
font_01_sfnt_off0000d5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AC 11088 bytes
SHA-256: 8c0dfd0301c4dc9374b317c2aebdf459ffdf199cd495b2f8f47312f9dad06160
font_02_sfnt_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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