Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdafc8371d4f2d9…

MALICIOUS

PDF

76.3 KB Created: 2021-03-21 12:15:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0352608eedf2dbfc2becc46bce74a8f1 SHA-1: 74fdba506ccb749491cf157927da1ec6dcbffafb SHA-256: 3cdafc8371d4f2d9e515b6e49aa7abbc98e22a842f403e433d7796976797877d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/award?keyword=all+basketball+rules+pdf PDF link annotation
    • http://drovazvenigorod.ru/sukapijey6la9.pdfIn PDF document text
    • http://kvyovk.xyz/9399659910mrbrf.pdfIn PDF document text
    • http://inter-kalinka.ru/76014641573wssn8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383571/normal_5fff646424afd.pdfIn PDF document text
    • http://kyukty68.xyz/4974220307l00qi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403129/normal_60466a36893e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405945/normal_60320ab53df62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448746/normal_6043320fe91f8.pdfIn PDF document text
    • http://legionmone.xyz/zorugebupisitejkyas1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aff1337-beed-4839-8c5c-219c3f03d6b4/hoo_son_of_neptune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1217dd09-5553-4844-90a3-5c73676b0a14/fl_studio_12_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8db58a07-90bf-4b92-ae9a-4117e98a59c0/jesus_be_the_center_chords_key_of_e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e30c4337-3cbf-4abd-9989-9d4ffd9df865/dimelolag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca76932a-8480-427e-9c6a-02b335be0e3a/vesuz.pdfIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_fd1ce2992c794bf3978ef7138e5be2b2.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_81e0b3fad39741b5959bf1f902876e1d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd3a4d0a-8b63-4822-91fc-8af950b57f5c/iomega_ix2_firmware_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a97f7800-681b-4f35-94f7-07b5d497673e/tupazetixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae64b18-3e6e-4eaf-9f26-6892cda5f00e/telugu_movie_screenplay_free_download.pdfIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_2d6fd511b6f543acba6eb938a7e070a2.pdf?index=trueIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_852fdf06b3d04935a0ec79443032ff78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b1ca902-98c1-43b5-a492-ed5860bcfb1a/77021096971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/277fe9e0-267f-4942-8751-55f46b10d596/on_my_honor_i_will_try_lyrics.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_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 5228 bytes
SHA-256: 020b14861771196b98830b9469695c53e42722cb679f959a68669ff4ba6bb439
font_01_sfnt_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 10196 bytes
SHA-256: 55647b0d1155c166dbec00762128223eeb7928734918f5a7bb0683ce83f562b0