Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b051df9e3d7585…

MALICIOUS

PDF

70.0 KB Created: 2020-11-29 22:59:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 494fb3b8b441623759ef9c896da93f2c SHA-1: 21d53be643f365ec1d63988878c54c1d3710626d SHA-256: 43b051df9e3d75859a3199632b28e1c0456787ba3d74b0d69d3cfc423f3b1195
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal a PDF containing a mass external link farm, with one notable URL being https://trafftec.ru/123?utm_term=romeo+peach+festival+children%2527s+parade. While no scripts were explicitly extracted, the presence of numerous external links suggests the document's primary purpose is to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=romeo+peach+festival+children%2527s+parade PDF link annotation
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/lidefofolilizelado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405904/normal_5f9263297b26b.pdfIn PDF document text
    • https://noxetetejiv.weebly.com/uploads/1/3/4/3/134391164/8056773.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/lezepasidixabazafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385004/normal_5f9934c15062c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369915/normal_5fbad44abff2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369907/normal_5fc3b851bcff6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_5fa5d5d13d1da.pdfIn PDF document text
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/2178bdcc51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/50180598165.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/weather_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/61827908426.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/hardest_game_in_the_world_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/mario_wings_to_the_sky_red_switch.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29C 5496 bytes
SHA-256: b42b06fa5eac7f0dd4c3a9cb1a1fcbe1d6d0a3f908a37454b248099e72e5fedc
font_01_sfnt_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 11220 bytes
SHA-256: ccfc48ab03179dc7b9d82e33dd3f7ceb59a53ee904d162097d08260eff999506

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