Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd1c648dd2b4064…

MALICIOUS

PDF

74.2 KB Created: 2021-01-25 17:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0043c93a2cfe54bca899c929accba8c9 SHA-1: 3b54ca031adcfd3941886db38f54fda0ad495f93 SHA-256: 9bd1c648dd2b4064881662fe658285a1800e214a9770836c166756020890496e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm. Several heuristics, including ClamAV and ML detection, flag this file as malicious, specifically as a phishing or trojan PDF. The presence of numerous external URLs suggests an attempt to redirect users to potentially malicious sites, which could be used for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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.
  • 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=al%2528h2o%25296+3%252B+%252B+na2co3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405925/normal_5fd8f3c1c1003.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/jicjhD5/senya_and_oscar_the_fearless_adventure_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/bezedono/ichiha1/tulsa_pac_ballet.pdfIn PDF document text
    • http://info-pages.ru/flying_car_real_driving_game_downloadrymy9.pdfIn PDF document text
    • http://znatural.space/zafalamumawijifa0rea9.pdfIn PDF document text
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/buxigisam.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/wXjgoic/beranerijujuxusixejiz.pdfIn PDF document text
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/febetewe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417145/normal_6007cd56a9f05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_5fda50203de8b.pdfIn PDF document text
    • https://cdn.sqhk.co/raxinosi/hhbiiUI/metal_slug_3d_ps2_iso_usa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pimifemegizak.epizy.com/13204772151.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/usa_hockey_score_sheet_label_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/85543343207.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEA 2856 bytes
SHA-256: 6a7390c9e634f7f167841a75ffa617ce3f7010ba402b4c06ad0a47e5500b6a59
font_01_sfnt_off0000ca14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA14 5204 bytes
SHA-256: c58080392138217d031d0c9c2ae5fafc45cd7641839dfcc06f2646a14422bd6c
font_02_sfnt_off0000dbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 13340 bytes
SHA-256: 571c332f79a1970c3caa1e45a96637dc17a87da1c7212046fb87abf2064ee738
font_03_sfnt_off0001065a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065A 16132 bytes
SHA-256: 0845746d8e0f76c2c57e53a5d0c2d2ba36ed31c4724e2802406f297ba1795667

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