Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a81ff3963a4f949…

MALICIOUS

PDF

85.7 KB Created: 2021-04-08 19:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d0e4045ba19d2f59cb84d0efa67e0c06 SHA-1: 2f7b1e116154f2355d47c81e288720a0f4424f2b SHA-256: 4a81ff3963a4f949b1f0366b83e06920c8f1646a35b118ae29719b6cbabcfbca
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain and containing a 'strik' path, indicative of a phishing or malware delivery attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are commonly used for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=hamilton+beach+flexbrew+49983+user+manual PDF link annotation
    • http://rajizaloka.iblogger.org/65017308798.pdfIn PDF document text
    • http://fiwogozugoxiget.22web.org/practical_intelligence_in_everyday_life.pdfIn PDF document text
    • http://gefupokilive.iblogger.org/ganesh_aarti_songs_in_telugu.pdfIn PDF document text
    • http://nulepunu.22web.org/nutojeriteposor.pdfIn PDF document text
    • http://nigopebeluv.22web.org/cerf_volant_choristes_partition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xofiketur.rf.gd/ikea_bedding_sheets.pdfIn PDF document text
    • http://rolaxaja.rf.gd/xisufafoluriwilikop.pdfIn PDF document text
    • http://lewabebobi.rf.gd/gejalexumobokinased.pdfIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_2771cc70bd594d8ea97bebea6027ca17.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/969358f7-cf99-40f0-9925-637cbe4ff439/30306331082.pdfIn PDF document text
    • http://zoletafexogixa.epizy.com/19137645558.pdfIn PDF document text
    • http://sarupuxev.epizy.com/99663215561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9af2db1-072e-45df-a61f-911347c73ffb/2001_suzuki_sv650_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34df1db0-603a-46a8-a5b8-cf4ecdae5e32/508065226.pdfIn PDF document text
    • http://jemazuwosedujem.epizy.com/65575332788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba5886be-f4e2-499c-b323-e73d993ea719/netgear_wnr3500lv2_admin_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6c900ea-921c-40b5-8599-5ccb3ccd6038/32841566007.pdfIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_d4e7dedfbf2d4417af8ceb9d36ffc204.pdf?index=trueIn PDF document text
    • http://kesufelitam.rf.gd/how_to_calculate_density_of_salt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cf5764b-c802-479d-baa8-c7128ffb80b6/engineering_drawing_symbols_and_their_meanings.pdfIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_b58bb14072b54b569dd6efba36f3aac2.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 5868 bytes
SHA-256: 4c139611b67a7e6385199ead2fc192730b81ba64d4ca4f86d16fd66385242cfb
font_01_sfnt_off0000fb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7B 11924 bytes
SHA-256: 96067cb69eaf84d48341d7fcc816ccf6966bba04a19a47e014857cbfbf82cf50
font_02_sfnt_off00012446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12446 16508 bytes
SHA-256: 76c58d9dad2553210f58dd276edfbe5dbdf64153339314c97a5850829df6aff1
font_03_sfnt_off00013aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAD 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3