Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6d3beb4c53b2b2…

MALICIOUS

PDF

70.0 KB Created: 2020-12-21 07:58:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7302d3d263b9cc17614eb8214fc27b8d SHA-1: dd60160569379c26098b99a47bacb085284812f6 SHA-256: 7b6d3beb4c53b2b2e0bcbd1cf316fd32742defbf5753c615545e153d874473df
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan-like behavior. The heuristic 'PDF_SEO_LINK_FARM' suggests the document's primary purpose is to host a large number of external links, likely for SEO manipulation or to redirect users to malicious sites. The presence of embedded URLs further supports this, with one pointing to 'trafftec.ru'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=shooter+games+unblocked+weebly
    • https://teregurejojexol.weebly.com/uploads/1/3/4/8/134879353/japokageges-zefudiperazos.pdf
    • https://guwopatuzigumi.weebly.com/uploads/1/3/4/3/134334434/bde1a4e.pdf
    • https://cdn-cms.f-static.net/uploads/4366647/normal_5f927e7b90ea2.pdf
    • https://cdn-cms.f-static.net/uploads/4481423/normal_5fae7ebbc869f.pdf
    • https://cdn-cms.f-static.net/uploads/4452206/normal_5fd9afa7008b1.pdf
    • https://mobugozuko.weebly.com/uploads/1/3/4/8/134869294/salegedizu.pdf
    • https://cdn-cms.f-static.net/uploads/4464722/normal_5fa925d18dc02.pdf
    • https://cdn-cms.f-static.net/uploads/4393183/normal_5f92365f86084.pdf
    • https://cdn-cms.f-static.net/uploads/4379362/normal_5f9cd00adb08a.pdf
    • https://renibopasuviwi.weebly.com/uploads/1/3/4/3/134305424/kuvagesuwut.pdf
    • https://cdn-cms.f-static.net/uploads/4490256/normal_5fad8ab862c37.pdf
    • https://rumidevuj.weebly.com/uploads/1/3/4/3/134310249/726d1a747c95.pdf
    • https://vukijimox.weebly.com/uploads/1/3/4/3/134358494/modupomede.pdf
    • https://sowozulame.weebly.com/uploads/1/3/4/7/134733070/kodalatoxukilikulabu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/niwotipugonuvoz/kgf_chapter_2_songs_naa_songs.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe3d5beaf37e3b6467362b/1606303067619/mcdonalds_wifi_connection.pdf
    • https://s3.amazonaws.com/jotizifime/jijezi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d390.bin
3398690f0a5c50feec37656956100593489f9a28c226e2bc19f2d93e8b4313d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD390 5852 bytes
font_01_sfnt_off0000e763.bin
f59bfc5ae7b3c06fedeed3ddcfa04f9fff1cf5ba5dfc2ef02df6f011325a00bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 10344 bytes

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