Malicious PDF — malware analysis report

Static analysis result for SHA-256 70cb3b781d5bd4d8…

MALICIOUS

PDF

81.5 KB Created: 2021-02-12 15:37:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d069ee8f5df4b4e1e2cab5a1715de9a5 SHA-1: 1c4091d221d8336115aeeec003cac7bb6e65d6f9 SHA-256: 70cb3b781d5bd4d8bd0a494087b06e125d2f4d63b5650e3325f9ec436b51770c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=harvest+moon+animal+parade+guide
    • http://gozipoxeget.iblogger.org/sewajubunovadobav.pdf
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/naxenizazo-fajojeruxuveg-tijorozawun-difapiwuremazot.pdf
    • https://juzuxadubibipa.weebly.com/uploads/1/3/4/6/134685448/pijorevo-panoxibewoti-wadunivatozepo-zibifujupinef.pdf
    • https://static.s123-cdn-static.com/uploads/4470387/normal_5feb475bc8528.pdf
    • https://static.s123-cdn-static.com/uploads/4466408/normal_5feed6308810b.pdf
    • https://static.s123-cdn-static.com/uploads/4379987/normal_60045c3e9c093.pdf
    • https://cdn.sqhk.co/neliwuwo/OHhgEhg/wapam.pdf
    • https://wuzovogupo.weebly.com/uploads/1/3/4/7/134720757/jijotimutaki.pdf
    • https://static.s123-cdn-static.com/uploads/4489041/normal_5fddce5960210.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zidenigad/gunisemuzatuf.pdf
    • http://saritimiramig.rf.gd/25973858321.pdf
    • https://s3.amazonaws.com/wefadep/xatezukinopifani.pdf
    • https://s3.amazonaws.com/xakusineba/whatsapp_story_love_video.pdf
    • https://s3.amazonaws.com/ruzumeb/jaxidakarowepujepiluvuvul.pdf
    • https://s3.amazonaws.com/lomuper/43534450963.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e396.bin
ef29739d39e17af3a0d4aee8f4c92a22bdacd25200ada123b96295fbec7ebe00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 5180 bytes
font_01_sfnt_off0000f58f.bin
f55a356eb456adb4fec0e99d499a7e967708831e1e52e50fd855ce9ff0ca930b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 5184 bytes
font_02_sfnt_off00010713.bin
092ee89179dee59c1ef8097a5115efb287448eba5a05b76a91db14cd35c8665b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10713 10360 bytes
font_03_sfnt_off00012a8d.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8D 4324 bytes

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