Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa9cc3af507f8e3…

MALICIOUS

PDF

73.8 KB Created: 2021-02-13 21:01:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f47575c2f91868d9a1121b43a7f6857c SHA-1: 85fc6c2065750e6abae7cd088d423b0a6b229025 SHA-256: aaa9cc3af507f8e3bee8fed82c16f64ece7fcacaa253643dcbe4ecfb2a52824c
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a phishing or SEO manipulation scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful 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://baarspo.ru/wix?keyword=solo+baric+l7+12 PDF link annotation
    • https://cdn.sqhk.co/wokinuge/jf4gdhg/69707255199.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465703/normal_5feed3ac51c52.pdfIn PDF document text
    • https://butevexonukuzi.weebly.com/uploads/1/3/2/6/132681970/decda4c615b4d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411702/normal_600599d626ce7.pdfIn PDF document text
    • https://xudomulur.weebly.com/uploads/1/3/4/0/134040538/mudifu_tokidukupopo_wabegeso.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/mujalipevaz.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/hAKeW2W/mojutinenuxagokiragizalan.pdfIn PDF document text
    • http://kigurumi.org/fekobiwatipobekofip19gws.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469126/normal_5fd67e5ab5a02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410678/normal_601736d48ce70.pdfIn PDF document text
    • http://itchia.space/periodic_table_for_chemistryqttdo.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/sJefidt/arcane_quest_legends_mod_apk_1._1._8.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/hjJejf1/basketball_hoop_game_cool_math.pdfIn PDF document text
    • https://zajawegunane.weebly.com/uploads/1/3/4/3/134332092/7efeaa599.pdfIn PDF document text
    • https://cdn.sqhk.co/wifurovud/EjjIhcD/best_music_ringtones_tamil.pdfIn PDF document text
    • https://bujozimadepaxed.weebly.com/uploads/1/3/4/6/134615651/6d1b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402261/normal_602448f271029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473903/normal_5fd62edd6a1db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 5124 bytes
SHA-256: ed8fea771166f0d87c94ecd325aa94e1adc1b24f85aaf237cf15ce9713462d4d
font_01_sfnt_off0000f353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 10944 bytes
SHA-256: 0d1d51b5f7f812373c07ec3acecba2c69b82f47462be2ebb32cf4c862d7b4ba4

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