Malicious PDF — malware analysis report

Static analysis result for SHA-256 539aa4679cb41c8c…

MALICIOUS

PDF

69.4 KB Created: 2020-11-20 04:27:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bb44adb76b249f7c16898c93f5335d78 SHA-1: 9d287e476b1889fa9d5a1620e0828884d04370cd SHA-256: 539aa4679cb41c8c5314f0364d16e8b58feab0cf3a636bbee48c7a10a13b5c72
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' pointing to 28 external PDFs. The ClamAV detection and ML classifier strongly indicate maliciousness. The embedded URL 'https://traffking.ru/123?utm_term=layer+2+protocol+testing' is likely part of a phishing or malware distribution scheme, and the presence of external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/123?utm_term=layer+2+protocol+testing PDF link annotation
    • https://buritovetozew.weebly.com/uploads/1/3/4/4/134486370/wupinutofakawe.pdfIn PDF document text
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/24db62.pdfIn PDF document text
    • https://defagetomorig.weebly.com/uploads/1/3/4/5/134576552/17adac12d0e10.pdfIn PDF document text
    • https://losepubi.weebly.com/uploads/1/3/4/5/134502138/daad90ed.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/sonutopexaramuf/my_hero_academia_season_3_dubbed_cartooncrazy.pdfIn PDF document text
    • https://s3.amazonaws.com/jolufozo/lifetime_florham_park_nj_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/18338970442.pdfIn PDF document text
    • https://s3.amazonaws.com/kalufizefem/accounts_that_are_free_roblox.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/washing_machine_burn_barrel.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/56227441797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63cbae61-55cd-49a7-930a-555dfab4f966/software_estimation_demystifying_the_black_art_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c2c9255-3550-41d2-8160-f7dec806f559/49554752604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/919e6884-cd2d-42fb-a591-1e667584d4ee/aigis_persona_3_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3afb9d80-bee6-4ece-b878-c56911391e10/gugepomalusomidebela.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_off0000c4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BA 5064 bytes
SHA-256: c3ab6e5aad29d42f71e4cced103f97b7f1dbab72aca3c9517569306415ffc3bc
font_01_sfnt_off0000d608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD608 10816 bytes
SHA-256: eccca707b53fdb6d98880981f45a43f573076367f42822875391cad43fd4db50
font_02_sfnt_off0000faed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAED 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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