Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c644853be46e81…

MALICIOUS

PDF

89.3 KB Created: 2021-03-02 01:21:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c96fb8f93e981ac5131169139c3a4e8d SHA-1: 7c997bc692f5c0ca261427701e7dd2ebf7b2bda6 SHA-256: 98c644853be46e814ea0cc9f85a6e2faa317a50a0942e743c7843db0d0db93a5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, indicating a link farm or SEO manipulation tactic. ClamAV and ML heuristics flagged this file as malicious, specifically as a phishing trojan. The embedded URLs suggest a potential distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/award?keyword=chapter+test+a+the+human+population+answer+key PDF link annotation
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/19d829cb6891.pdfIn PDF document text
    • http://kasyanbeauty.com/what_does_stability_control_mean_on_a_car7zwvi.pdfIn PDF document text
    • https://solawelosadi.weebly.com/uploads/1/3/1/8/131857655/lalufowefirunej-durabet-femuwibeta-vabijujufitixe.pdfIn PDF document text
    • https://netajetuz.weebly.com/uploads/1/3/4/6/134651380/1801344.pdfIn PDF document text
    • https://joxedobiwot.weebly.com/uploads/1/3/5/3/135350216/5b60531.pdfIn PDF document text
    • https://xuleminemixek.weebly.com/uploads/1/3/5/3/135333740/4541165.pdfIn PDF document text
    • http://copyrightproblem.com/tiktok_download_pc_play_storedegbp.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/bjdhejc/wheels_on_meals_meaning.pdfIn PDF document text
    • https://fupakedozoj.weebly.com/uploads/1/3/1/4/131407080/pugaduzakudilavow.pdfIn PDF document text
    • http://porn77.design/calendar_2020_november_printableevohy.pdfIn PDF document text
    • https://pusugokejetajek.weebly.com/uploads/1/3/4/7/134765622/megibilol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuvuvemalazot.epizy.com/asia_pacific_map_free.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_off000122b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B4 5220 bytes
SHA-256: c0014f87720a4857a3d7767e4c7ccf8f0ec57fbc84cc6d5bbcfdcba87aa5bb5f
font_01_sfnt_off00013458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13458 10424 bytes
SHA-256: 435956f99312e5614339b68a211a90433f68464e90de708e701b5023485bfc91

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