Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb7040a54a4463c…

MALICIOUS

PDF

74.7 KB Created: 2021-04-03 00:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0ed050ac801802f061db4c63e49ee41b SHA-1: b35de3eccabfd2e75113cad385404d7b6f9106e9 SHA-256: ddb7040a54a4463c9cf438474ecac73a0bea8bc8525219cc90d30a18d8e06cca
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/award?keyword=mapa+carreteras+cantabria+pdf PDF link annotation
    • https://gixipimeno.weebly.com/uploads/1/3/4/3/134310045/likitewixori.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/nojuze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464869/normal_5ff10d4b0c090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450438/normal_5fd89c08a9e2c.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/bruce_lee_kid_age.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501212/normal_603ebbab010e1.pdfIn PDF document text
    • https://banodita.weebly.com/uploads/1/3/4/3/134311275/figirogupule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465136/normal_6012cebc988eb.pdfIn PDF document text
    • https://tifidanubaliso.weebly.com/uploads/1/3/2/7/132740836/niwuzusesivu-pugotu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_cddd3d6180a94b54ab25399e1e170094.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc6946b-d964-4d7d-9d24-175d2610c04c/ejercicios_pasado_simple_verbos_regulares_e_irregulares.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8184e4e-afb5-4589-8455-50d95ebfdd2c/sokatumafepaditixe.pdfIn PDF document text
    • https://94ac7338-8c66-48ed-b7e4-01cccba3eff0.filesusr.com/ugd/9b8421_0849143856b14445b19bb8ca1d33a33b.pdf?index=trueIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_c20de621a94e48c6806008c586ac5141.pdf?index=trueIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_1933012cde7a4799ae9cb893ffcfe66e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc6211c7-90fe-48f1-9968-a89c21c2f9ee/kulisifepodojubepurup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7d8504f-9e3f-411f-ae5c-49848e9af778/homework_pass_images.pdfIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_64a6ef42898e4edabeff0eff5c5a1b32.pdf?index=trueIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_c4b79c79e7b741c1a80a3216331fe7a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/189dff2c-c570-4b31-a28d-7cf9b9c29098/lane_big_man_recliner_spring_replacement.pdfIn PDF document text
    • http://lazoxiro.onlinewebshop.net/28278530700.pdfIn PDF document text
    • https://60883313-e483-4213-bdf2-3844198a3b35.filesusr.com/ugd/3ba96b_e7204c207bde49ff8ba94913f3e0a1a7.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_off0000e466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 5264 bytes
SHA-256: 728fb40c0e356cdb6d5e3186c8489e7facdb2e4a025fd2ec5dedc50b39b142c9
font_01_sfnt_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 11996 bytes
SHA-256: 34010b5b6fe04c01ef5c235379f714389cdb49555ea328468227429ca7bbfa59