Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08557c804704ce0…

MALICIOUS

PDF

66.3 KB Created: 2021-03-15 07:39:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 869075d278f107025b335ed26cbaea2f SHA-1: d3dc92e1cf6944df12d24145dd1fcb9000bf2811 SHA-256: a08557c804704ce05a5df62bbf348199791be49fc39dec3749aa05f1b7a0e306
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing or trojan PDF. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious content or phishing sites.

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://botokaw.ru/wix?keyword=mippa+stair+trainer PDF link annotation
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/8afa35db.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/jaVhh9Y/76023310961.pdfIn PDF document text
    • https://cdn.sqhk.co/webunojixisa/9ghhdif/11626922939.pdfIn PDF document text
    • http://arenda-comp.space/54885910023eeo1.pdfIn PDF document text
    • https://zoliparudoluja.weebly.com/uploads/1/3/4/6/134662317/ruxokate.pdfIn PDF document text
    • https://nabidojanafo.weebly.com/uploads/1/3/4/4/134455463/fomorejufezotitur.pdfIn PDF document text
    • https://fuvepuzineg.weebly.com/uploads/1/3/4/4/134463404/9537711.pdfIn PDF document text
    • http://znakomstva69.space/why_wasnt_bill_of_rights_included_in_constitutionc6drr.pdfIn PDF document text
    • http://greatholl.com/28677111932j9xi9.pdfIn PDF document text
    • http://halfraire.xyz/interjection_worksheets_for_grade_5s9rum.pdfIn PDF document text
    • https://pagiburefi.weebly.com/uploads/1/3/4/1/134108706/2771656.pdfIn PDF document text
    • https://wuwexolajux.weebly.com/uploads/1/3/0/8/130814226/8fd4551259.pdfIn PDF document text
    • https://cdn.sqhk.co/fovuxugo/nlUZOji/1588883425.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/Wpijgh8/13766659631.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/GichaAe/red_swordtail_fish_babies.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/gi2cNua/delado.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wolina/gizujolulawejiw.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/annie_on_my_mind_banned.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/lezonazurosev.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/auditor_general_report_2018_south_africa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D0 4788 bytes
SHA-256: 9826159942f43c34cae9a120c2e816073ab4580418a3ec27863ed62afc1a7e08
font_01_sfnt_off0000d82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82E 10196 bytes
SHA-256: 5333d30747f39d41a19bddf72a3fa4ccba8b08a1187e783d759c2a2719d1f6f0

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