Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0403e945620c00…

MALICIOUS

PDF

78.1 KB Created: 2021-03-11 14:55:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: baa6546ae5af51cca7a9250a0cbcec00 SHA-1: a8f1f27bda29db9be47beb0ab02b1ab6cdf80915 SHA-256: 7f0403e945620c0058d4c7f82542327568b11b4affb858b407d486ac3b797a34
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs pointing to disposable hosting. The document body, though heavily obfuscated, suggests a lure related to a '2005 nissan sentra repair manual'. The heuristic firings indicate a mass of external PDF links, likely intended for SEO manipulation or to distribute further malicious content, aligning with a phishing or content-distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=2005+nissan+sentra+repair+manual PDF link annotation
    • https://cdn.sqhk.co/baxafapunubi/eghIvhi/81748655231.pdfIn PDF document text
    • https://cdn.sqhk.co/xuteposidobi/fu6hgzq/battle_royale_wallpaper_apkpure.pdfIn PDF document text
    • http://zuwawew.22web.org/liftmaster_41a5021-1m-315_remote.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/jhlhgAy/aliexpress_coupon_new_user.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/a25f7767e.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/hbjfTn7/57215205286.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/cbELoQM/cat_warrior_deck_mtg.pdfIn PDF document text
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/jaralavobemazim.pdfIn PDF document text
    • https://cdn.sqhk.co/dujagazatad/icOiigz/estimator_job_application_cover_letter_professional.pdfIn PDF document text
    • https://dudisavaw.weebly.com/uploads/1/3/1/3/131380109/8354040.pdfIn PDF document text
    • https://femobideja.weebly.com/uploads/1/3/4/7/134735935/jetutosutu.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/heVDqdG/castle_crashers_tier_list.pdfIn PDF document text
    • https://cdn.sqhk.co/rejelozekazo/eUXhbgc/56131618893.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gugogedufos.epizy.com/govinda_namalu_telugu_mp3_free_download.pdfIn PDF document text
    • http://xifazofikumufe.epizy.com/fofuwuxetegiv.pdfIn PDF document text
    • http://tuvojiteziw.epizy.com/bakugan_wii_game.pdfIn PDF document text
    • http://vebaxabono.epizy.com/lukabidu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 5040 bytes
SHA-256: 492baf95440415923bb642c825afefcc9f757bba8fbc82ab4b6861928b4a4a29
font_01_sfnt_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 10492 bytes
SHA-256: 498244f1c7298dbf9d6c52e90ee9d20572f10af8b24810a1782433ee9d1334fa
font_02_sfnt_off00011d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D07 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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