Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce3a0fbacbf8ae7…

MALICIOUS

PDF

78.5 KB Created: 2021-02-19 16:58:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a08aa0c5b435b5b617d36f872395c27d SHA-1: cae15c00146110e7542f691b8bcba0131d8fee24 SHA-256: fce3a0fbacbf8ae78fcada5ae35536291a943abe13fe095cb0487e90b6202031
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment 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 and ML classifiers identify this PDF as malicious, specifically a phishing or trojan variant. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=how+to+learn+communication+skills+in+the+workplace PDF link annotation
    • https://cdn.sqhk.co/nefakovuwot/j7Mgh53/free_online_horse_jumping_cross_country_games.pdfIn PDF document text
    • https://cdn.sqhk.co/givikufat/heqEjqQ/toon_blast_cheats_iphone_no_survey.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/gg9jf7h/55750024492.pdfIn PDF document text
    • https://cdn.sqhk.co/ramidazumiko/rC1SJgc/lenovo_smart_clock.pdfIn PDF document text
    • http://bemelegevew.22web.org/dekarunudonakapawus.pdfIn PDF document text
    • https://cdn.sqhk.co/zomuzesirira/d9jihdS/dejezexigifozudosevod.pdfIn PDF document text
    • https://cdn.sqhk.co/naxibibu/gctM4Yh/square_body_chevy_truck_bed_for_sale.pdfIn PDF document text
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/wajuluvov.pdfIn PDF document text
    • https://cdn.sqhk.co/ledusefugize/KgiSjbE/during_world_war_1_the_ottoman_empire_quizlet.pdfIn PDF document text
    • http://nexekeb.iblogger.org/bitujubo.pdfIn PDF document text
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/lejolisovef_jefuz_tolujexo_nugozetogukuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407552/normal_6014a40a25347.pdfIn PDF document text
    • https://cdn.sqhk.co/galudubujuwa/iIjcjhH/push_and_pop_operation_in_stack_example.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzixije/gGQRmjb/mummy_returns_streaming.pdfIn PDF document text
    • https://nelajelax.weebly.com/uploads/1/3/2/7/132712676/ff61c88f121a6.pdfIn PDF document text
    • https://mulikejigezom.weebly.com/uploads/1/3/5/3/135351375/xutozuka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460946/normal_5fd198abd1222.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ramejepazino.rf.gd/unit_4_sensation_and_perception_worksheet_answers.pdfIn PDF document text
    • http://ruzuvune.epizy.com/bezurenopafoso.pdfIn PDF document text
    • http://jabaxuzadowepep.rf.gd/75445984550.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_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 5292 bytes
SHA-256: afb86b86936cffc4db317e374ae7895a28ddd1793aadcbfdcfe265e229ec1ffd
font_01_sfnt_off0001076e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076E 10724 bytes
SHA-256: de57cbd8efb91e6c54d382ccb440c6c08d2282c382a053e3c106b5a8fbad80bd

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