Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f27ce829b5c522b…

MALICIOUS

PDF

86.3 KB Created: 2021-05-01 07:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2dae00f6abd43d2d1fa4e184f6256cb3 SHA-1: 27de5a93b23009dc839004154fb2ecbef2a574dc SHA-256: 2f27ce829b5c522b3f83b5fc78b39b481fe7abe2e34f2718b85ab5bdd79262c4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/strik?utm_term=strollers+that+go+with+chicco+keyfit+30 PDF link annotation
    • https://fejoburu.weebly.com/uploads/1/3/0/8/130813906/mafop.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/KTjeggj/frag_pro_shooter_para_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455881/normal_6059cf14f1675.pdfIn PDF document text
    • https://cdn.sqhk.co/terisuzuji/dtjcUid/five_nights_at_freddy_s_toys_lego.pdfIn PDF document text
    • https://vewudati.weebly.com/uploads/1/3/0/8/130873955/dujoba_jexelunoresipem_xuvobuwawa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_5fdb5ad635c27.pdfIn PDF document text
    • https://raligeledow.weebly.com/uploads/1/3/4/8/134893256/vavom_jomexa_dujizixiriba_kisibo.pdfIn PDF document text
    • https://cdn.sqhk.co/worenora/R8CqZgj/23609890179.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370989/normal_5fc6297d92eb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_603cc5851c0af.pdfIn PDF document text
    • https://cdn.sqhk.co/bejomewuv/VicCEia/pubibuzakijax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_4541efcf9d5c45e5a94d842fac06f12d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83dc8641-bd61-482c-b44c-0ff54fb48f2e/graphing_and_solving_quadratic_inequalities_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef72f4b-c3cb-485a-8946-94cd5916a99b/vuwipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df17bd4-9271-41ad-9c3a-46c64b583372/76537629664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7796e320-411d-4011-9f6d-ec84a9feccb9/wudivokujodage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2099a6e2-053e-40dd-a664-d0dbb8da31df/mimidanusisililudelixedat.pdfIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_9fa524d84de9495e986eeaf271eaa11c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51bf6ae7-f1e5-4115-9982-148f4976833b/sovutipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f32a1d54-07e7-4ac8-a1ff-f503c14bf88a/coding_apps_for_beginners_ipad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c355e731-2257-4233-bae3-3ce782690194/jisibanus.pdfIn PDF document text
    • https://7d7e9a41-1eea-4c72-a0b8-c0e3d642de37.filesusr.com/ugd/513cfa_417da34a49bd4d01ad36bd69108c3439.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/265454d8-9a58-428b-a357-9f9d793e9eec/prince_lionheart_premium_wipes_warmer_instructions.pdfIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_777d1b8228124cbe9eaef02ad6691642.pdf?index=trueIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_7337a2745819495185a664ced1b2e337.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11330 5808 bytes
SHA-256: e049fd2d0cf92ec6bb2bd395e737500af59d85ee3011ca7631bb4c885e94cd94
font_01_sfnt_off00012706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12706 10772 bytes
SHA-256: 1a2dedcf196be020b8b4fa64985ec2493102647eff667cbfcb9a4d9edbe69c00