Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1079d6cfed75fc1…

MALICIOUS

PDF

106.0 KB Created: 2021-03-22 06:00:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: af0dbef1c10c8f1aba26e7e678a8d3b9 SHA-1: e92575f59ca00084dfa86ee62151eb268d7a3aa9 SHA-256: d1079d6cfed75fc1deee8c8ff7df51d36316608f9680ff1d2a9c98f9c3fa6682
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, including one pointing to 'jottigo.ru' which is associated with a keyword search, suggesting a phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/wix?keyword=homefront+revolution+trophy+guide PDF link annotation
    • http://car-den.ru/27539590670bct41.pdfIn PDF document text
    • http://resipowepo.getenjoyment.net/yardman_lawn_mower_carburetor_adjustment.pdfIn PDF document text
    • http://geosen.net/85917458351kfbwy.pdfIn PDF document text
    • http://hookup154.site/what_is_rhetoric_theory3t35f.pdfIn PDF document text
    • http://iranianvc.com/kuwaxatarubenalacjkcs.pdfIn PDF document text
    • http://help-igcopyright.xyz/advanced_accounting_solutions_manual_hamlenug4ni.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/1991087903.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bonanelokuweje.rf.gd/15013638533.pdfIn PDF document text
    • http://mesesoriran.epizy.com/cds_recruitment_2019_notification.pdfIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_4ae115f114634b0592393c6c8b36ef1c.pdf?index=trueIn PDF document text
    • https://88e92b2d-3ddf-41b2-a2ae-4af48bfba274.filesusr.com/ugd/b74686_f5eaa44a9f8b403f8a1877ce48ff5433.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f04f45c0-25fc-4ec3-8f7c-ac064b9711b6/gabaxabanukajiposiwasub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4eeff87-17af-4c57-b099-0389348e63fc/71959497477.pdfIn PDF document text
    • http://xojasupolovoga.rf.gd/drum_cadences_sheet_music.pdfIn PDF document text
    • https://c751e6e8-0850-424d-b14e-d7ae46260796.filesusr.com/ugd/bc1028_25c819934bf54dae99346984c7277eb9.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E21 5192 bytes
SHA-256: 84751453a83207a1f9155f44607ecc32783ef4c62cbfdc27dbbf407a0350ee60
font_01_sfnt_off00015fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB0 11032 bytes
SHA-256: 02d36b6d8b60b2b152aafa743658506c6745a809a2104117399f5fe8d9be9616
font_02_sfnt_off00018596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18596 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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