Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e432fb372e9cc73…

MALICIOUS

PDF

77.1 KB Created: 2021-03-25 10:49:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7acce8be1043b0974817bc3fa02c2427 SHA-1: ea45ee7230599bcd4370be67dc753a825eb59312 SHA-256: 6e432fb372e9cc736216b8e1530c3f7809bc16ca692136b28ef2828097af4601
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 0.9997

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://jumiwimov.ru/strik?utm_term=animal+charade+cards+printable PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375703/normal_5fd060978e5fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451049/normal_600fbba90969a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428045/normal_5fec01ce8f375.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366395/normal_600905ff0ec96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448549/normal_603c3a39321ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419424/normal_5fff56b503ce0.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/rovikibixu/vegudemeroz.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/practical_english_phonetics_and_phonology.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/how_to_write_an_equation_for_half_life.pdfIn PDF document text
    • http://ferogexomemu.rf.gd/apush_concept_outline_period_2_answers.pdfIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_6940886ad32c41eb9d11d13b383910bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/96331067051.pdfIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_7fa78e31f92b48e9bb686ba2a05baa6b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pilazi/treatment_h_pylori_guidelines.pdfIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_fd3f04c1d8a348759e79e772b382e17e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/pupexabup.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/bengali_full_movie_hd_1080p.pdfIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_3d2f1775c1024e048e4f29bd87a367b8.pdf?index=trueIn PDF document text
    • http://sodakavebiku.rf.gd/denewo.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/73815541072.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_off0000e345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 5120 bytes
SHA-256: f9e0c2d7ea18be2edd8646cb2a385c1b66f59e5f10749b4063f262dab20374fd
font_01_sfnt_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 10960 bytes
SHA-256: d25d44e21c35175ecc8df2c46af683c04d9afb904da03a4a9569586cab0e5512
font_02_sfnt_off0001196a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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