Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef65660538c581e…

MALICIOUS

PDF

78.0 KB Created: 2021-02-11 10:12:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8cd164d897c386f65066d965d15f55b4 SHA-1: 5ecd2650186be1ce255d725d571074be8e62ef8d SHA-256: 9ef65660538c581e5198a45dd974de812cd40b008fa6c8c092f0cd36d389a06a
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, indicating a link farm or SEO manipulation scheme. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification yielded a high probability of maliciousness. The embedded URLs suggest a phishing or malware distribution attempt.

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/aws?utm_term=wifi+signal+booster+app PDF link annotation
    • http://maximizator.xyz/57763425739m4k2x.pdfIn PDF document text
    • https://sisuwupuwadigif.weebly.com/uploads/1/3/1/4/131437471/nakutodoxa_xowenikebed_kifonulival_rigorexifej.pdfIn PDF document text
    • http://it50save.info/petrifilm_coliform_plates8pbd9.pdfIn PDF document text
    • http://geniusenglish.space/vlc_for_pc_32_bitclvcj.pdfIn PDF document text
    • https://vitukotegow.weebly.com/uploads/1/3/0/7/130775282/birolakekudemat-fawatoniwiduf.pdfIn PDF document text
    • http://siteznakomstv69.space/18775291141t2agq.pdfIn PDF document text
    • http://gamedv.design/jasinigurcfc5.pdfIn PDF document text
    • https://tedotedonux.weebly.com/uploads/1/3/0/7/130775879/pubomarowuleziwis.pdfIn PDF document text
    • http://remont-pc.website/74739681270hsgo6.pdfIn PDF document text
    • https://pusobufuronuwu.weebly.com/uploads/1/3/4/4/134475569/be19ca8916c.pdfIn PDF document text
    • http://senteber.site/hesi_pn_study_guidedridd.pdfIn PDF document text
    • https://mexupapomumag.weebly.com/uploads/1/3/0/7/130775103/2fb2cadca.pdfIn PDF document text
    • http://ranking-se.com/dual_citizenship_mexico_price233ec.pdfIn PDF document text
    • https://kerozusokenizil.weebly.com/uploads/1/3/1/3/131383247/0ff9cf3b5ea76c4.pdfIn PDF document text
    • https://voliguxuzewiwa.weebly.com/uploads/1/3/4/7/134762967/2166149.pdfIn PDF document text
    • https://xawimoveparuz.weebly.com/uploads/1/3/4/0/134040397/8852260.pdfIn PDF document text
    • https://pavibizad.weebly.com/uploads/1/3/0/7/130740264/71887d20629a.pdfIn PDF document text
    • https://puraxexi.weebly.com/uploads/1/3/4/7/134718411/wijaso_japapiravokeja.pdfIn PDF document text
    • http://kpovli.ru/uber_driver_application_download44d8m.pdfIn PDF document text
    • http://gsmall.space/the_constitution_vocabulary_builder_section_2_answer_keyblw8p.pdfIn PDF document text
    • https://fosuwelu.weebly.com/uploads/1/3/2/6/132695698/6756725.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_off0000f3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 5224 bytes
SHA-256: 2c4424ed9723bda94ce17c80f82eba1db3b9c76e2e7a1ba79eeade748cd3d6a1
font_01_sfnt_off000105de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DE 10888 bytes
SHA-256: a7e5c88936fc63d5f4f59b0253145aafb42d2197a9f19d83b7bbaff06bcde1d4