Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cf3de28864199d…

MALICIOUS

PDF

75.2 KB Created: 2021-05-03 08:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d4c460bdd2831c1886344c6c24cf6c7c SHA-1: 550716a9be2181cfa6251cd2fc561514d4da584a SHA-256: 90cf3de28864199d99a1908dd94e44bc1f7b131348655cb88dfcd2f09550316b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs, with a primary suspicious URL pointing to 'fokemale.ru'. The document's structure and embedded links suggest it is designed to redirect users to potentially harmful content or facilitate SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://fokemale.ru/strik?utm_term=fsa+grade+5+writing+samples PDF link annotation
    • https://cdn.sqhk.co/xuwadezab/6ieyhfo/sas_zombie_assault_4_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jojevirelo/NRavgip/animal_texture_cinema_4d.pdfIn PDF document text
    • http://vifaborabab.22web.org/abnormal_psychology_dsm_5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_604e70f9b2d8d.pdfIn PDF document text
    • https://tifowufiwadoxi.weebly.com/uploads/1/3/4/0/134098290/9141493.pdfIn PDF document text
    • http://porabobamefomuk.22web.org/tetas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487916/normal_5fdf052b02162.pdfIn PDF document text
    • https://cdn.sqhk.co/dagedazi/F8hbJs6/lifivemekirijex.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/ggejggd/box_office_2020_movies_hollywood.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420760/normal_6053be3709add.pdfIn PDF document text
    • https://lejawoxaniw.weebly.com/uploads/1/3/0/7/130738778/zaxizuwuxutijusike.pdfIn PDF document text
    • https://vedixoba.weebly.com/uploads/1/3/4/8/134864822/sajixukadilexo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446512/normal_5ffea3995da24.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/geGjaCe/annual_security_incident_report_template.pdfIn PDF document text
    • https://zedasadexim.weebly.com/uploads/1/3/0/7/130775923/91818.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://165b0ab0-89c3-4517-b88f-e2bd0c55d975.filesusr.com/ugd/97b555_6b52004b4b0f44b28737ed67eeccf48f.pdf?index=trueIn PDF document text
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_d9405806cad444ada2f44123a3329894.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/siniravi.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/pisarofawap.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/target_sodastream_flavours.pdfIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_f4da7c7080eb46108dfc97510dcbe500.pdf?index=trueIn PDF document text
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_328f5af480e943199e01aee808414f20.pdf?index=trueIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_61f92bc4dc5c42b3955d1f911ea177a2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lakadutof/bose_quietcomfort_35_software.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE0 2136 bytes
SHA-256: 8f42026abfd590f5ad926ae6b2dbf5242c76c7541f4528a016c8563c16fa5478
font_01_sfnt_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 5452 bytes
SHA-256: 88ccfe03456b443c4d02a71de4e43b808ab37aeb26e9f44a41cbe89791ae4b27
font_02_sfnt_off0000f824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 10952 bytes
SHA-256: d43df92659667ca20e42a0e8cfc533cad17cb8692852d4160c38b1f1b4cd6fa7

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