Malicious PDF — malware analysis report

Static analysis result for SHA-256 6456926c30e8ea3c…

MALICIOUS

PDF

76.1 KB Created: 2021-01-21 15:08:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cef8e34210dd9fb389a14214be00dbc5 SHA-1: e923108b298bbe839702a6fcce0f4281970e5996 SHA-256: 6456926c30e8ea3c01cd411bb70356e44f6ac261562de67e32a7fa83d636e3ae
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains numerous external URIs, including one pointing to 'trafftec.ru', suggesting it is designed to redirect users to potentially harmful content. The PDF structure and embedded URLs indicate an attempt to lure users to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://trafftec.ru/123?utm_term=how+do+i+focus+the+oculory+in+mzulft PDF link annotation
    • https://site-1175879.mozfiles.com/files/1175879/28432345354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368759/normal_5fa1f40deb395.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/MjKieyn/alien_invaders_game_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/gcqQYhj/animation_movie_wallpapers_for_mobile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_5fd3be03ad752.pdfIn PDF document text
    • https://site-1177743.mozfiles.com/files/1177743/xokika.pdfIn PDF document text
    • http://wuwisometojone.66ghz.com/quotes_for_whatsapp_dp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_5fd949f5b84a7.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/4iagf3a/planet_der_affen_survival_caesar_stirbt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420470/normal_60023f7edd5de.pdfIn PDF document text
    • https://site-1174959.mozfiles.com/files/1174959/45590334216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451205/normal_5fa408a0b9387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_5f87aafb7db33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413835/normal_5fe206842620f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f8d4f05d1767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_5faa2042ae6b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lukepepe/33229059938.pdfIn PDF document text
    • http://nanoxamovafosox.epizy.com/fabric_softener_sheets_for_sensitive_skin.pdfIn PDF document text
    • http://solukirakologi.epizy.com/pan_africanism_notes.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB4 5256 bytes
SHA-256: a0dbbb10a397c6cbdc4023cc51f18a5d437df7a9caa19010f723e23bce95ee26
font_01_sfnt_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 11536 bytes
SHA-256: 83fe490bee89c490aa6139b1cfc973b8d587c7e6c93a1eb7e4f90ad27f168733

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