Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9bd6d3e4b8f893…

MALICIOUS

PDF

77.2 KB Created: 2021-03-21 09:17:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7145af78c32fd9ced50f8d3b275e5699 SHA-1: 75fb6a7ce916d06fcb0a149ae91029ad0686d342 SHA-256: bc9bd6d3e4b8f893cf8cae3f67bfee8b3e195c97402cf6da31bdf0560a966ffd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating a link farm or SEO spamming attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/wix?keyword=car+expenses+worksheet
    • https://fojowixejomad.weebly.com/uploads/1/3/2/6/132681658/wekefi.pdf
    • https://kapupigabila.weebly.com/uploads/1/3/4/7/134729593/6bfb451.pdf
    • https://vavaterojitenoj.weebly.com/uploads/1/3/4/8/134898986/pipowajo.pdf
    • http://rexapeduke.66ghz.com/78305990291.pdf
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/4cae37.pdf
    • https://vijizonumek.weebly.com/uploads/1/3/6/0/136034009/e1480c5b37.pdf
    • http://vozivovog.scienceontheweb.net/31659355659.pdf
    • http://faxixovojaja.sportsontheweb.net/what_is_the_best_robot_vacuum_in_australia.pdf
    • http://dovulup.iblogger.org/aircraft_maintenance_manual_boeing_777.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a20dfd03-b480-4f4c-a1cd-90435bc9cf40/focusrite_control_2802_price_in_india.pdf
    • http://debagejusuwaj.epizy.com/newaz.pdf
    • https://s3.amazonaws.com/votubukaxogilix/meladupijij.pdf
    • http://wuxininozikup.rf.gd/what_language_is_high_valyrian.pdf
    • https://s3.amazonaws.com/votubukaxogilix/unc_academic_advising_major_worksheets.pdf
    • https://s3.amazonaws.com/telasebisu/what_is_meant_by_the_term_community_development_block_grant.pdf
    • https://s3.amazonaws.com/vuforewebub/94840186479.pdf
    • https://s3.amazonaws.com/tulosa/15848608684.pdf
    • https://s3.amazonaws.com/mejados/lockpicking_guide_classic_rogue.pdf
    • https://uploads.strikinglycdn.com/files/b03d0663-332b-46f5-8c35-d99aa17e7dcb/guralelafipipemu.pdf
    • https://uploads.strikinglycdn.com/files/e629fa67-cb52-488a-b7fe-476e5243c38e/83096593507.pdf
    • http://fixidil.atwebpages.com/gaxafurevidu.pdf
    • https://s3.amazonaws.com/zazelujeju/windows_10_upgrade_assistant_latest_version.pdf
    • http://nipotozutawavi.rf.gd/when_to_use_commas_ap_style.pdf
    • https://uploads.strikinglycdn.com/files/04697c67-abb2-4ad6-bfe6-5f3387fc5189/how_to_change_font_size_on_dymo_letratag.pdf
    • https://s3.amazonaws.com/rorives/fodomuxevomazago.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_off0000f018.bin
1ef0291bea8d4c6398e76ab0c63f13b83f2acbf8b0f03684012a6f88f8ea3779		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 5004 bytes
font_01_sfnt_off00010129.bin
a97e59632bb891fcff7166624710e911858467e3ba4d2704658a857ea80ce4b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 11220 bytes

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