Malicious PDF — malware analysis report

Static analysis result for SHA-256 28cb13a1c88a79f4…

MALICIOUS

PDF

83.0 KB Created: 2021-03-11 16:55:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: bd36b795b4834ea310daa254819b0521 SHA-1: d85e923a0bb1f4412cd0c59f5fc29919345c407a SHA-256: 28cb13a1c88a79f4566ecbcf6589544e0f3f2341bdbf1c659b8cc13c80e6cd8f
244 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to potentially malicious redirectors and disposable hosting. The heuristic firings indicate a malicious redirector link and a large link farm, suggesting a phishing or scam attempt. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence score support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=knowledge+representation+in+artificial+intelligence+notes+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426813/normal_6023fa0b1ed5f.pdfIn PDF document text
    • https://cdn.sqhk.co/topefebi/dhS5icg/71280135829.pdfIn PDF document text
    • https://cdn.sqhk.co/teganipuputu/I0jb4gj/51340168079.pdfIn PDF document text
    • https://nezafilajulimef.weebly.com/uploads/1/3/4/4/134481311/xavurepetezumu_buwowuxilok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_6017a4efa12cf.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/dVypUjb/29420902709.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382960/normal_5fce152685bb7.pdfIn PDF document text
    • https://zifakilis.weebly.com/uploads/1/3/2/3/132302733/2323545.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/Rjjkhia/66296561556.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/mH248if/dmv_license_plate_number_lookup.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/pPgg3jj/soturazedunazetev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410679/normal_601cfe13b9dde.pdfIn PDF document text
    • https://xubetiduradana.weebly.com/uploads/1/3/0/7/130739761/nukozuwi.pdfIn PDF document text
    • https://zapineri.weebly.com/uploads/1/3/4/7/134707132/vakek.pdfIn PDF document text
    • https://cdn.sqhk.co/tajugajobib/gEXibgf/fast_crafting_guide_rs3.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/jcifFTl/62734166745.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/likerajatob/aws_cli_cloudformation_deploy_wait.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/animal_anatomy_drawing_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/personal_financial_literacy_crossword_puzzle_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/chicco_nextfit_zip_convertible_car_seat_juniper.pdfIn PDF document text
    • http://pagarome.rf.gd/sidiboxanalirojamutosav.pdfIn PDF document text
    • http://soweverupez.rf.gd/10629262569.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/exercise_mathematics_form_1.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_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 5172 bytes
SHA-256: c7e7a070139edc8997f172350fff20c44716f9a2b77dbc1f4ca9317faa9e6331
font_01_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 11632 bytes
SHA-256: d8d91fb31a064b0effbf5fb191f5a9d722429f10af7cadf148387de2d5ddac46
font_02_sfnt_off00012f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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