Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac90435ebff7214c…

MALICIOUS

PDF

84.2 KB Created: 2021-04-14 06:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bfb92926f1efac225500e57e85302f4 SHA-1: 1ae644b3b9706de63d6d28be897216c789a4f20a SHA-256: ac90435ebff7214c8b1abb1f13f2aa8795b5ca30278a753484c2b44e4deb235f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or malware distribution, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=introduction+to+psychology+course+guide+%2526+activities+manual
    • https://mogasijukunuv.weebly.com/uploads/1/3/4/0/134042787/ralitekop_jijibumonigixa_pagelerufekorix_bafewe.pdf
    • https://duzozutilitu.weebly.com/uploads/1/3/0/9/130968921/ziwip.pdf
    • https://sokuvefababadax.weebly.com/uploads/1/3/1/8/131856373/4461861.pdf
    • http://fishing-rods2.club/duvekevozanadazuvejerelil4cvnm.pdf
    • https://static.s123-cdn-static.com/uploads/4451352/normal_5ffb6d2cc0712.pdf
    • http://sibatike.getenjoyment.net/kimefivelizozuvukod.pdf
    • https://cdn-cms.f-static.net/uploads/4478703/normal_6041bb367f52a.pdf
    • http://jolidulikan.scienceontheweb.net/jurnal_tentang_bakteri_coliform.pdf
    • http://repair-kompov.ru/720672740881vqd1.pdf
    • https://static.s123-cdn-static.com/uploads/4475217/normal_5feeadcec679d.pdf
    • https://cdn-cms.f-static.net/uploads/4401712/normal_6033a8a3f3eff.pdf
    • https://tazerodine.weebly.com/uploads/1/3/4/5/134598813/gurifox-tidevosikipo-gewodun.pdf
    • http://remont-pc.website/25392003384u8bg7.pdf
    • https://vunidiripoga.weebly.com/uploads/1/3/1/4/131453449/192058.pdf
    • https://sorasewemo.weebly.com/uploads/1/3/4/3/134358680/kijinazibi.pdf
    • https://static.s123-cdn-static.com/uploads/4421630/normal_5fc9e1f7939b8.pdf
    • http://mosomupusafebin.medianewsonline.com/dulatafopufefivosawedunu.pdf
    • https://wakukaxowemaba.weebly.com/uploads/1/3/5/3/135303752/wetab_selixo_kurebibi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/silubebebefuju/88011133474.pdf
    • https://s3.amazonaws.com/babuxufarizuxur/poulan_pro_bvm200fe_carburetor_rebuild_kit.pdf
    • http://jokosen.atwebpages.com/92665384585.pdf
    • https://s3.amazonaws.com/zufojadibi/can_t_connect_to_hidden_ssid_android.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_off00010db1.bin
578cb7b250dffcf41953d7cd97b1bd865ac9fd833412b21ae680135587b9d8d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB1 5164 bytes
font_01_sfnt_off00011f45.bin
e032421e4fedfd9f7df5356df5170f0759a909a783912dfeba3d6479686b7f17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F45 10144 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.