Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f11ff1f1f40eb9…

MALICIOUS

PDF

69.9 KB Created: 2021-03-11 11:35:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecfffcdbaaaa7fc074433e3b4a5bfdb7 SHA-1: b97d1dd12800115f36e319ce383f0ddbb5ab17b2 SHA-256: a2f11ff1f1f40eb9a8f04ef7fd2f5c5c6372471af2452c00d72ddb2e584280c5
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 hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to deliver secondary payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://jumiwimov.ru/strik?utm_term=bose+solo+remote+control+instructions
    • https://wedemewimobuxet.weebly.com/uploads/1/3/4/3/134309086/mugipud.pdf
    • https://lusebedadejaxid.weebly.com/uploads/1/3/1/4/131407110/rufij-xezok.pdf
    • http://qwert-ita.fun/eye_of_the_beholder_definelh2zw.pdf
    • http://tikovg.xyz/how_to_charge_motorola_talkabout_250qb9cu.pdf
    • http://vitrinachel.ru/swashbuckler_approach_to_distal_femur46ls0.pdf
    • http://chategratis.online/formal_allegation_law_definitionw2ieb.pdf
    • http://new-leggins.site/duzefirejawelerugxmsnn.pdf
    • https://biwizodem.weebly.com/uploads/1/3/4/6/134650183/zazegazilibexerin.pdf
    • http://tryraisins.club/71351731910z7ood.pdf
    • http://groshyk.site/luwodefovabako295qg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jidosatikim/sample_incident_report_form.pdf
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_9dff689e6d3d4dfcae150d30cc13f0fe.pdf?index=true
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_feb2331210a7415396bd7472349462ff.pdf?index=true
    • https://8d275f60-8e36-4e70-8574-b6d542a617c4.filesusr.com/ugd/dbf6c2_b830efa286454332ad68ccd9d1c759a0.pdf?index=true
    • https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_675b3af0d2444efc86273143810db096.pdf?index=true
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_0672b1c212404278a7cd32f588907920.pdf?index=true
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_fc16641099c64bf2a33ba77fc1205a68.pdf?index=true
    • https://s3.amazonaws.com/faduxodiwo/konekutenugaxuvibezu.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_off0000d6a0.bin
4acd0f25d0f25ed5195008061a8d4010f60d0c09199b6a8097a2fc8c9a0c6a4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A0 4784 bytes
font_01_sfnt_off0000e6cf.bin
b32892962cd4578fff1b8a20a98c36d1817d2c58787860e286d27f8a8ac72132		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CF 10196 bytes

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