Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43cb5ae41e16d0c…

MALICIOUS

PDF

77.5 KB Created: 2021-05-02 20:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fb7ebdc24dac2a9f16155aa3dc6ce4d SHA-1: 2819ae68fab897191ea796ec262817bb6c5ffb10 SHA-256: d43cb5ae41e16d0ca39e9b000d026df5587766b79a208a24ec59a8b36475ab9c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated for SEO purposes, and one prominent URL points to a suspicious domain. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of embedded URLs and the overall structure suggest a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/strik?utm_term=al-quran+al-kareem+lafz+ba+lafz+urdu+tarjuma+pdf
    • https://cdn-cms.f-static.net/uploads/4459478/normal_605fe90b1a7d2.pdf
    • https://cdn.sqhk.co/kozuvurop/Fjfjaha/codigo_civil_guatemala_decreto_ley_106_actualizado.pdf
    • https://cdn-cms.f-static.net/uploads/4408875/normal_604f038484f09.pdf
    • https://cdn-cms.f-static.net/uploads/4380857/normal_60563aaf4bb45.pdf
    • https://cdn-cms.f-static.net/uploads/4451556/normal_6056d8faa4854.pdf
    • https://cdn.sqhk.co/rularijulen/9jhchiM/nice_button_down.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_dd3d296178924ca9ad3edc5b3686c968.pdf?index=true
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_22ec0a87ab6c48ed9a1806ca2f51a0df.pdf?index=true
    • https://s3.amazonaws.com/rokuwapesu/grammar_exercises_for_ielts.pdf
    • https://80cb706b-a9cc-40e6-9cd2-ad5688d6c4a8.filesusr.com/ugd/c84a73_88eb1cd3efb548999c1a98f9d2e3989e.pdf?index=true
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_26a4a1fe53bc4acb833a4a20975cf37f.pdf?index=true
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_05cd740a9bd14dd1a12b3a62d1375cfd.pdf?index=true
    • https://s3.amazonaws.com/patotale/chuchel_android_4pda.pdf
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_0585daf0691d45e383538a6cf13193d3.pdf?index=true
    • https://s3.amazonaws.com/zifozujiwi/video_instagram_iphone.pdf
    • https://457cefd1-268f-49c0-9ca4-ced5ac281e6b.filesusr.com/ugd/983758_5cbcc7b1bfc9475fb88bc4c585a85232.pdf?index=true
    • https://s3.amazonaws.com/risalenefazozo/99637163636.pdf
    • https://s3.amazonaws.com/xelimewat/pigibumosogom.pdf
    • https://s3.amazonaws.com/pujirageg/how_to_choose_a_cigarette.pdf
    • https://s3.amazonaws.com/fokapikow/57028728329.pdf
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_261a09120d984d4a879525e45173792d.pdf?index=true
    • https://s3.amazonaws.com/jebupofedijakuk/diagnosing_hypertension_guidelines.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d160.bin
5a86e6486393a1089bd19172e93168187dc6b7ba97e5fd62a637366709ce494f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD160 5484 bytes
font_01_sfnt_off0000e408.bin
72d06d44fb42b2280b65c7197bc51fbffe3311335941af1802e2594347f974f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 10696 bytes
font_02_sfnt_off000108af.bin
8006b6888798482db588cde9ecbf7940a41673baed0ce29d99649a2a358e65be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 18620 bytes

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