Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41f3d8ec4031357…

MALICIOUS

PDF

81.2 KB Created: 2021-03-25 22:17:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a66be20ff3c6a9b7e5a1ccc18cbd3a86 SHA-1: dbab474a568a65556228ff18d20643e73045bb7a SHA-256: a41f3d8ec4031357824ddf96f68d222839f5863f49c1748607e64bb9ee16dec1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, with one specifically pointing to a suspicious domain ('xezojetit.ru') that is likely part of a link farm or phishing campaign. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest 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-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://xezojetit.ru/strik?utm_term=stamina+body+trac+glider+1050+vs+1060
    • http://nextauto02.ru/holmes_egg_air_purifier_cleaninga7nsh.pdf
    • http://trelon.fun/1979762072913769.pdf
    • http://opendouche.xyz/3028386356gq6cc.pdf
    • http://sale50.pro/is_a_crock_pot_insert_dishwasher_safeke8su.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xixonu/52347633705.pdf
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_b0fde5ddc37b4f3a860081abf63a12da.pdf?index=true
    • https://s3.amazonaws.com/viromibukoleliw/the_one_pot_ketogenic_diet_cookbook.pdf
    • https://uploads.strikinglycdn.com/files/217c9798-b384-4d70-9635-5549ece26971/busugufovulej.pdf
    • https://s3.amazonaws.com/zuses/90988153931.pdf
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_abe1b9eefee64eeebc9cd8240097cd20.pdf?index=true
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_0e6b7544ecbb49d19c1e92df80f3b4a7.pdf?index=true
    • https://s3.amazonaws.com/bupaxomu/joxoselokowegovup.pdf
    • https://s3.amazonaws.com/tumasun/paint_3d_software_for_windows_7.pdf
    • https://s3.amazonaws.com/lixasifasi/beetroot_health_benefits.pdf
    • https://s3.amazonaws.com/buganabowumujef/gebemerawabev.pdf
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_02edcffe14ba4b63896e6b300e66c5f0.pdf?index=true
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_fb1784c4171640f4b2ed6c942ec74286.pdf?index=true
    • https://uploads.strikinglycdn.com/files/45626145-c563-42e2-aa4b-d6d3c051999c/what_are_adaptive_skills_in_special_education.pdf
    • https://s3.amazonaws.com/gazijewevan/mrsa_skin_infection_treatment_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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f040.bin
bd2282c7c3b4188eccb3163d0cf5f9146a74cd41cfbc78bb2b10919cd31b4594		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 5924 bytes
font_01_sfnt_off0001044b.bin
7c9b5a4e6dfc11cbeec71ff4d75fe8fd040447556084dfbd9b5b0180e087a171		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 10748 bytes
font_02_sfnt_off000128e7.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128E7 4324 bytes

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