Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7c0e8134212f34…

MALICIOUS

PDF

77.5 KB Created: 2021-06-08 18:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70dd01d4643a9b72015ecfd0ca8739ee SHA-1: e90ef3b1812e9aff998942286aeece5d1eb19f41 SHA-256: ab7c0e8134212f343f392c166b26b947d3d6c8b516af5ff2507309522b1388c4
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of 'utm_term=cross+trading+roblox+discord' in one URL indicates a potential lure related to online gaming communities. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cructi.ru/pbw?utm_term=cross+trading+roblox+discord
    • https://cdn-cms.f-static.net/uploads/4447878/normal_60117ff12f649.pdf
    • https://piwuwati.weebly.com/uploads/1/3/4/4/134404243/pukemakepobur_numofup_juwunilizox_kenomaxine.pdf
    • https://vekosakebasagi.weebly.com/uploads/1/3/4/7/134743747/4c86d8f57.pdf
    • https://kazugimopizefew.weebly.com/uploads/1/3/1/4/131406381/dodovaripifuriwebaru.pdf
    • https://static.s123-cdn-static-d.com/uploads/4489834/normal_60b74d1e9dde0.pdf
    • https://fivoputan.weebly.com/uploads/1/3/1/4/131408393/jimowemorov-wajazobiwux-baxuxiram.pdf
    • https://wivapofeselaf.weebly.com/uploads/1/3/5/3/135317026/tewosapujurofatatape.pdf
    • https://static.s123-cdn-static.com/uploads/4425921/normal_5fc5ec7971bc0.pdf
    • https://cdn-cms.f-static.net/uploads/4374980/normal_600e558d433a2.pdf
    • https://xuwapitevakud.weebly.com/uploads/1/3/2/6/132682402/dosuwebabito_gerafizonitok_zetotinowabi.pdf
    • https://wefikugozakilo.weebly.com/uploads/1/3/1/0/131069992/lutipobifej.pdf
    • https://static.s123-cdn-static-d.com/uploads/4477163/normal_60b6e769da591.pdf
    • https://cdn-cms.f-static.net/uploads/4369143/normal_60220a77f222f.pdf
    • https://sivabukejiwija.weebly.com/uploads/1/3/4/4/134459056/lulilutenurebolatuxu.pdf
    • https://weradarodoruz.weebly.com/uploads/1/3/4/7/134744379/resatokonis-jamebami-bogugajot-wemililexof.pdf
    • https://cdn-cms.f-static.net/uploads/4422912/normal_6054b66e96883.pdf
    • https://static.s123-cdn-static.com/uploads/4370528/normal_5fffbbb2ee4fe.pdf
    • https://savigopomela.weebly.com/uploads/1/3/4/8/134886046/a40b9a625cd1168.pdf
    • https://bozuzagon.weebly.com/uploads/1/3/4/6/134666742/8682454.pdf
    • https://xuserufibizu.weebly.com/uploads/1/3/4/1/134131258/994270.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2dad929b-f12e-44f8-9e5b-0b75066ee688/gerixokusamobizo.pdf
    • https://uploads.strikinglycdn.com/files/8317752c-eaff-438e-91e7-46b4dcb5c578/masimo_rad_8_error_codes.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_off0000f13b.bin
11fb0f55f96c159867cce370362d42991379d4a5fa6691140e8170e9c970f784		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 5220 bytes
font_01_sfnt_off00010308.bin
bbba8d8fd1fbd5fae8a0c6153c8b44d1957c4a1a6a8e46ed5644703a8ec8ed2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10308 10916 bytes

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