Malicious PDF — malware analysis report

Static analysis result for SHA-256 085aab6cb39a9d82…

MALICIOUS

PDF

84.9 KB Created: 2021-03-27 14:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bc99101c97651ccb28e75e6f944e244f SHA-1: 78839aa3e50725413143b060773bc7ad824f2ad9 SHA-256: 085aab6cb39a9d82e8c52f8dbb85f0d4e54c463c8ebcd954e4e3210dc99b1cbe
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary suspicious URL being https://dugedepap.ru/strik?utm_term=tipos+de+comunicacion+oral+panel. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm hosted on disposable domains, further supporting a phishing or scam campaign. No scripts were extracted, but the presence of multiple external URIs points to an attempt to redirect the user to malicious content.

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://dugedepap.ru/strik?utm_term=tipos+de+comunicacion+oral+panel PDF link annotation
    • http://future-techno.ru/madajusiruwidinitijjdb7y.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://mafaregasinuviv.22web.org/back_and_forth_motion_labquest_2_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5fd61d5b0be1e.pdfIn PDF document text
    • https://foguvebosep.weebly.com/uploads/1/3/5/3/135315209/9698286.pdfIn PDF document text
    • http://nat-fru.space/30471343444eiqei.pdfIn PDF document text
    • http://krokoboko6.xyz/iptv_windows_10_freealbi0.pdfIn PDF document text
    • http://copyrighthelpcentral.com/what_matchbox_cars_are_valuableabbyf.pdfIn PDF document text
    • https://vudasanuvopiw.weebly.com/uploads/1/3/4/7/134737570/zapodijibirike_mufupoxu.pdfIn PDF document text
    • https://talaxosukizarom.weebly.com/uploads/1/3/0/7/130775084/3fa3d168ad4b05e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479917/normal_6008635212f28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371267/normal_6007abb8f0cbb.pdfIn PDF document text
    • http://maska-respirator.shop/requirements_specification_template76iau.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/66330634-4c45-4a14-98f3-93a976556c70/21_irrefutable_laws_of_leadership_list_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e001777-ca14-468b-922e-cb50dadca839/value_of_dale_earnhardt_collectibles.pdfIn PDF document text
    • http://dalufiba.rf.gd/bullet_bike_sound.pdfIn PDF document text
    • http://jibunizaduz.epizy.com/spalding_basketball_system_warranty.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
    • 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_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 5168 bytes
SHA-256: 8e90f7a8e0882a4b582062b439392eadd7a99f660cad3d44a35820e76bb22f92
font_01_sfnt_off00010b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4A 10848 bytes
SHA-256: 5148937c5d70d95dad50a82b1357bab40f3283b89de740e214e4835fe6bf0578
font_02_sfnt_off00012f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F01 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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