Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1e2969af10a1e7…

MALICIOUS

PDF

113.2 KB Created: 2021-04-01 03:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5af5350916fb57e988c84e9b4d18e625 SHA-1: 9eda57802ef39f16808a45d97c4fd4eda0cedd07 SHA-256: 4d1e2969af10a1e7d874129d731bca951db89c19cc2d23fd7ee9be6295ee750c
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 to dynamically generated SEO-like URLs, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=directions+to+castle+rock+colorado
    • https://cdn.sqhk.co/kukisigafumi/gcjeIid/komabiziketoroj.pdf
    • http://temonaga.22web.org/exercices_sur_l_article_partitif.pdf
    • https://static.s123-cdn-static.com/uploads/4479226/normal_5fe3c7cf799cc.pdf
    • https://cdn.sqhk.co/kupulifip/UQgigcN/online_home_auctions_nc.pdf
    • https://static.s123-cdn-static.com/uploads/4454677/normal_5fe440282f257.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_1d34b95de6e84677b59f3df6c1818191.pdf?index=true
    • http://nozabikuj.rf.gd/tom_clancys_jack_ryan_season_1_cast.pdf
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_869897598cb84fc3b861cda9a9e6dca5.pdf?index=true
    • http://botemexake.rf.gd/openssh_authorized_keys_file_format.pdf
    • http://meraxemuvixise.epizy.com/how_to_program_chamberlain_garage_door_opener_to_car_without_remote.pdf
    • http://zakusomob.rf.gd/19249002744.pdf
    • http://josikilemasupi.rf.gd/91318050109.pdf
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_413a9dd35db94e3da402c553dd49b5a1.pdf?index=true
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_b8152e1d4b1c41dbbb3be4737e45c999.pdf?index=true
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_eb6388ec88cd496d967838f2a4886500.pdf?index=true
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_93d273ec6ded4e35bd765edd322665dc.pdf?index=true
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_278c24a0b98844128736dde5e396d281.pdf?index=true
    • http://gekokapemux.epizy.com/dyson_cinetic_big_ball_animal_user_guide.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_off000180a9.bin
35872bf92c4fba4980176a09bc5a62b49e46546289ef1d569187b0a6b7eea9a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x180A9 4996 bytes
font_01_sfnt_off000191b6.bin
25e8544a225cea3a78462c927450692ad18f41fd47d2050def82e9577067ad37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x191B6 11192 bytes

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