Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4335214882db8f…

MALICIOUS

PDF

71.4 KB Created: 2021-06-01 03:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fa54719e0b1856c294731e7830fd8a9 SHA-1: b9efeda9d0de7c3287fc5aca94393ce01d70222f SHA-256: 8d4335214882db8fc9e65a8153ed23e7f753971ef3c99e7fe23d4216afea0bfc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent link pointing to 'irlanc.ru'. This URL, combined with the heuristic 'PDF_SEO_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to a search query, reinforcing the lure aspect.

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://irlanc.ru/pbw?utm_term=is+there+a+reset+button+on+a+kenmore+elite+microwave
    • https://cdn-cms.f-static.net/uploads/4457281/normal_605712bb3c359.pdf
    • https://cdn-cms.f-static.net/uploads/4471475/normal_60591e2e9c200.pdf
    • https://cdn-cms.f-static.net/uploads/4405651/normal_606a33b8c4c63.pdf
    • https://static.s123-cdn-static-d.com/uploads/4373261/normal_60b30dcf5d69d.pdf
    • https://rajikaluniker.weebly.com/uploads/1/3/1/3/131383998/1124025.pdf
    • https://cdn-cms.f-static.net/uploads/4473619/normal_6057bc795ecc3.pdf
    • https://runonidalebemi.weebly.com/uploads/1/3/2/6/132682230/be948cec9337abe.pdf
    • https://cdn-cms.f-static.net/uploads/4469630/normal_605f7cb3e43ba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pamotekegopa.pbworks.com/f/never_back_down_2016_tamil_dubbed_movie_download.pdf
    • https://uploads.strikinglycdn.com/files/d537f1dd-08fd-4a8b-aa00-9d1fc432fe16/jasipef.pdf
    • https://uploads.strikinglycdn.com/files/79cc46fc-8e01-46be-a336-e7c87842b1de/85527901610.pdf
    • http://sajateves.pbworks.com/f/fr_legends_tbx_mod_pack_v2_download_apk.pdf
    • http://xojifot.pbworks.com/w/file/fetch/144413169/minecraft_13.0_apk_indir_cepde_cretsiz.pdf
    • http://kibumezi.pbworks.com/f/lifikapogunexaduwa.pdf
    • http://poforezufovu.pbworks.com/f/1585281092.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_off0000da03.bin
30c3719d7cd24b59b85d578263c2bc50216cdcefffa73eb29ffb0a5530d4c08c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 5332 bytes
font_01_sfnt_off0000ec15.bin
3d926cde287c3b49d095ffe31b10ea0628355af0473d48687c196ccc8543fb87
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 10668 bytes