Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6eb8c35c685173…

MALICIOUS

PDF

89.1 KB Created: 2021-03-30 17:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1e94ad7b4613e9a2e611fc66e08152fe SHA-1: ed18ea973f6662dd8b457528831a4beba772e0df SHA-256: 0f6eb8c35c685173cc3f45bf0b89f31f81a24e96e83963bc7c212f2cc0ce5257
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a generated document used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=how+to+maximize+tesla+model+3+range PDF link annotation
    • https://dikubone.weebly.com/uploads/1/3/4/6/134603537/loxekuwik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416501/normal_5fdbd45ba61f8.pdfIn PDF document text
    • https://cdn.sqhk.co/fasazani/hip9P3O/66484283580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460063/normal_5fe2f6aea2897.pdfIn PDF document text
    • https://cdn.sqhk.co/totarujined/ZjahekM/thinking_fast_and_slow_kindle.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405950/normal_5fcf444885b5b.pdfIn PDF document text
    • http://abistrans.ru/tabla_periodica_sin_colorg8ynp.pdfIn PDF document text
    • http://bitcoinchat.fun/518911898088lw59.pdfIn PDF document text
    • http://mmeueue.space/wumugalynhc.pdfIn PDF document text
    • https://cdn.sqhk.co/xonivozew/hUjbubQ/nofimavolakoli.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/jhaiap8/hepatitis_a_ab_total_reactive_quest.pdfIn PDF document text
    • https://devanuwi.weebly.com/uploads/1/3/0/9/130969177/gized.pdfIn PDF document text
    • http://kmplitka.shop/29084181523vuqcm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_fabab49c05954ee4bcac6cf64d886959.pdf?index=trueIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_88a6f13f57a54c4898ca34b977eaf889.pdf?index=trueIn PDF document text
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_e36c6cf04f184868b9bcd23fd1c166ec.pdf?index=trueIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_4d159235fa2741a684dc978325fb291d.pdf?index=trueIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_a4724de9325a4ce9851c08e7eed110de.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 5268 bytes
SHA-256: 125009f71bd0269906669ceabe482695eb71b7525dde68558a44e7e162f72eff
font_01_sfnt_off00012237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12237 11552 bytes
SHA-256: c2371ded79d2eec71d4d5793f7b7e77b713e2adfe7ebac4582ffd3d22b96eb30
font_02_sfnt_off0001490f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1490F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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