Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26c6db9681248fb…

MALICIOUS

PDF

80.6 KB Created: 2021-02-23 01:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6eca1e21ae1745979273ae72e222f76a SHA-1: 9945cd5c50d99e6a923f04d0758e2896a28be221 SHA-256: a26c6db9681248fb3e14fcdada5b6b25521c80cb86e93af00324e5a59ea68426
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and hosted on services like sqhk.co, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious 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/wb?keyword=what%20size%20tires%20are%20on%20a%202009%20hyundai%20sonata PDF link annotation
    • https://cdn.sqhk.co/fiporalisu/fifhdkU/97666882823.pdfIn PDF document text
    • https://cdn.sqhk.co/nimuxugemu/jjhgsge/tesco_robbery_ipswich_1991.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/jchcgeB/92994520311.pdfIn PDF document text
    • http://mafaregasinuviv.22web.org/management_of_hyperemesis_gravidarum_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/selusujava/jd04Sf5/pce._emu_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/dOFDcii/munusavomuzulewobazupu.pdfIn PDF document text
    • https://cdn.sqhk.co/mojesoje/haMKmja/pizamarisejixuxij.pdfIn PDF document text
    • https://cdn.sqhk.co/kunutewiwit/ikhiibg/50174831216.pdfIn PDF document text
    • https://nokavani.weebly.com/uploads/1/3/5/9/135966174/tobipunepukig.pdfIn PDF document text
    • https://cdn.sqhk.co/kevuviwa/ij38ig8/minigun_ammo_fallout_4_code.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://disobaratid.rf.gd/sigmund_freud_libro_interpretacion_de_los_sueos.pdfIn PDF document text
    • http://tatifamajerub.epizy.com/a_pair_of_tickets_amy_tan_citation.pdfIn PDF document text
    • http://sarozaxag.epizy.com/dlbcl_treatment_guidelines_nccn.pdfIn PDF document text
    • http://dadusuxu.rf.gd/gawutolojomowubonesuxevog.pdfIn PDF document text
    • http://jizubirusetidi.rf.gd/vomemoka.pdfIn PDF document text
    • http://wusumuforibit.epizy.com/buderus_logano_g215_owners_manual.pdfIn PDF document text
    • http://tedijafubivot.epizy.com/castleford_tigers_former_players.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_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 5476 bytes
SHA-256: 93e5ca6b943c39e9011631b1e98e003c4c43d683bfb0ddb4c935c68fe3b607f5
font_01_sfnt_off00010f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9E 10880 bytes
SHA-256: 8ade1e3f3e906b3ec4d0b62ed971fd3aa31c521628aac10a62f47dd535d8d8cb

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