Malicious PDF — malware analysis report

Static analysis result for SHA-256 409fc848464660ea…

MALICIOUS

PDF

90.8 KB Created: 2021-04-10 19:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b1e74507920a151aaacaf3f7e83bbb3 SHA-1: 99a530d04629507e4567d7aa5d429811346f06e6 SHA-256: 409fc848464660ea90f27540a974e3d6dbc0e8fd9471321864e3354ac3cca4e4
186 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 hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further support its malicious nature. The document body, though heavily obfuscated, appears to be a lure related to a search query, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://pelibifir.ru/strik?utm_term=what+is+the+significance+of+the+title+the+bluest+eye
    • https://rowimunikak.weebly.com/uploads/1/3/5/3/135346477/saraguzofis-dadajezi-tevogav-dunaj.pdf
    • http://shtangelkipokupkiitd.online/the_last_stand_lyricsvmrbl.pdf
    • http://cucoupon.info/71967320205r95vz.pdf
    • https://rumuwobega.weebly.com/uploads/1/3/4/3/134353317/sujokofobijeguf_wixigamoto_reditevo_runurevidebod.pdf
    • http://regsenatvumen.website/ronaxidinufobizobilai7jh.pdf
    • https://lanoxujuzon.weebly.com/uploads/1/3/4/6/134630121/zaxasanutin.pdf
    • http://anbieterbewertung-autoscoutch.com/freeze_alarm_for_cabinrbf5e.pdf
    • https://zixijatujomalul.weebly.com/uploads/1/3/5/9/135962278/4fecea0a.pdf
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/1835694.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ximupuv/tifesem.pdf
    • https://s3.amazonaws.com/megujobemegor/converse_plataforma_altas_falsas.pdf
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_27c65740f0134984857d1c778d47c767.pdf?index=true
    • https://s3.amazonaws.com/nitidadufetenu/kinetic_energy_depends_on_an_objects_mass_and_velocity.pdf
    • http://volajigatume.epizy.com/analysis_vs_evaluation_definition.pdf
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_41b833e50bb74ec98f379426e3192183.pdf?index=true
    • http://widurema.epizy.com/6123770292.pdf
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_b18ede8a5d37467aa1451a556c233a35.pdf?index=true
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_caf17f519bc2423c9d4ae60b791357ae.pdf?index=true
    • http://wijogural.epizy.com/report_downed_power_line_dte.pdf
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_842d7b38ec654c02966df15aa37899ed.pdf?index=true
    • 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_off00012616.bin
555b47f62d33d2f232f31a4f86d5c7d593fe7006ede7d3bd67f7c98cbf213508		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12616 5300 bytes
font_01_sfnt_off00013840.bin
6fdefa37e14c780a6b7ab50cbf05a716d664934acefe5398669779f701036ebf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13840 10916 bytes

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