Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4f7c36a76fe47b…

MALICIOUS

PDF

76.6 KB Created: 2021-04-01 19:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d6e677c3162c3178a09d8952fe41e7f2 SHA-1: 0facb79bdce0cc0489f02e85f21b0cd161da2f02 SHA-256: 4a4f7c36a76fe47ba1a90675d1650cc565ac5c71496cdee5f9e13c93bb8c6cdd
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be a lure related to a book title, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://ponafet.ru/wix?keyword=bridge+of+clay+markus+zusak+pdf PDF link annotation
    • http://toteganutiv.66ghz.com/a_68.5_kg_skater_moving_initially.pdfIn PDF document text
    • http://bulibujirifubof.scienceontheweb.net/hernia_de_disco_intervertebral.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457876/normal_5fc6d23ad371c.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/funny_writing_prompts_for_5th_grade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383680/normal_6033fe7cea20d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368485/normal_5fcdb8547e1eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_605c1af1523c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fobifuv.epizy.com/backup_contacts_android_to_iphone.pdfIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_1c830fba6f6b45ac90a5328053c0f41c.pdf?index=trueIn PDF document text
    • http://fonawemosel.epizy.com/dmv_permit_test_answers_ny.pdfIn PDF document text
    • http://wuburujezajewix.epizy.com/48059826324.pdfIn PDF document text
    • http://zebusodevig.rf.gd/how_to_change_the_primer_bulb_on_a_ryobi_weed_eater.pdfIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_b6f38f43926f429894e67dfa5a3035c8.pdf?index=trueIn PDF document text
    • http://simifumujabiguw.rf.gd/54492733098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d81f3edd-95a3-48c5-84d0-4385b94505ce/how_to_connect_a_logitech_unifying_receiver.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_d2893485c6594a44bef6e5a6d42fabae.pdf?index=trueIn PDF document text
    • http://jojulupijawide.onlinewebshop.net/adventures_of_tintin_comic_books.pdfIn PDF document text
    • http://jusopetikikij.onlinewebshop.net/el_magisterio_de_la_iglesia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03a34195-7e77-47e1-a059-df6c36bb6cb1/rlc_circuit_lab_report_abstract.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_off0000ea58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 5740 bytes
SHA-256: e7e2426943e0104986135525c0544a68a3ae0866a347c85dc42c15852d60682c
font_01_sfnt_off0000fde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 11436 bytes
SHA-256: db22b22835db076c306fd666b8f9cb9a8e01b0132f5aa59f99a6220e3b975929

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