Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d678c8f9a54a7a6…

MALICIOUS

PDF

72.7 KB Created: 2021-04-03 15:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c5e494c602bc50f68a43853170b58df SHA-1: fcbd1fd437bc109cb3fee6953d9a9ebc9aadd2c7 SHA-256: 2d678c8f9a54a7a62eb8c595f1683d77617782d832b2ee4c28f61a8dd894a05d
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=barcelo+maya+grand+resort+map+pdf
    • https://static.s123-cdn-static.com/uploads/4493549/normal_5feecf440aa80.pdf
    • http://tiwujatujoput.mygamesonline.org/gate_verbal_ability_questions.pdf
    • http://luxomozuk.mypressonline.com/arc_length_calculus.pdf
    • http://therarbooks.com/88294891981r03w6.pdf
    • https://cdn-cms.f-static.net/uploads/4413019/normal_605f5df327824.pdf
    • http://watogoda.mypressonline.com/anesthesia_and_analgesia_in_laboratory_animals_2nd_edition.pdf
    • https://cdn-cms.f-static.net/uploads/4375894/normal_605259458a509.pdf
    • https://cdn-cms.f-static.net/uploads/4451025/normal_60300825f37db.pdf
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5fd3126aebdac.pdf
    • http://takipleskazan.org/is_the_stock_market_on_christmas_eveat1sw.pdf
    • http://kogutojoveso.mywebcommunity.org/20976914761.pdf
    • https://cdn-cms.f-static.net/uploads/4423155/normal_5fd7b6f61a1a0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_85ba063eccd64543bf2f58fbafc5aadd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f2c2a7b7-4f10-4c4b-bd9c-bc886e4e8004/63997480769.pdf
    • http://terumalok.atwebpages.com/biology_quiz_bee_questions_and_answers_for_high_school.pdf
    • https://3d636ecf-b5c4-4691-845c-2d501a7a8090.filesusr.com/ugd/b09df1_8dcd1391820849389bc987779ac1292b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cf380224-89de-43e9-8e6b-a302d346d172/c_program_for_dummies.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f0.bin
60ff11f98ce2e522b82b31d7f07fbf01976a71c2cf3726e3068602a0ea3dc87c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F0 5624 bytes
font_01_sfnt_off0000ed09.bin
e8d23ec6b31800fb69d17ae52fa26c587e23e56e66105915af79a22338923d30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 11456 bytes

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