Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a6ea9afd9ef075…

MALICIOUS

PDF

72.8 KB Created: 2021-01-13 15:39:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bc038210beabc35833c8687ab195435f SHA-1: 4cf562c6dee7bcaa69604298f89a5cc6f7b3f72f SHA-256: 86a6ea9afd9ef07583ec612eaa5d33653e78db00257981d4f17edace88bbf0a6
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector and a link farm. It contains numerous embedded URLs pointing to disposable hosting and known redirector infrastructure, suggesting an attempt to lure users to malicious sites. The presence of a URL with a 'utm_term' parameter further indicates a campaign-like structure, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://traffmen.ru/123?utm_term=first+grade+rocks+clipart In PDF document text
    • https://cdn.sqhk.co/nexoratuxi/ge5WoQu/rokimasalefitiralax.pdfIn PDF document text
    • https://piwofenuxud.weebly.com/uploads/1/3/1/8/131871692/xamitufewanunap.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/b7c9667.pdfIn PDF document text
    • https://cdn.sqhk.co/ripudilibizo/gjjgijP/download_offroad_cruiser_simulator_mod.pdfIn PDF document text
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/vojoxumolakex-pudixoniwatugi.pdfIn PDF document text
    • https://beperiguvo.weebly.com/uploads/1/3/4/3/134320750/ginomowuvu.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/53Wifid/gambero_rosso_restaurant_taormina.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/24gdrbt/69045256749.pdfIn PDF document text
    • https://site-1178312.mozfiles.com/files/1178312/sports_car_tracks_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/wejupexuput/XifmjeO/62812571062.pdfIn PDF document text
    • https://juzudibat.weebly.com/uploads/1/3/4/3/134328144/lorugurip_lidamutafokos_dejepekoxaz.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
    • https://s3.amazonaws.com/webipejonavuv/biochemistry_lehninger_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A4 4944 bytes
SHA-256: ff382d27a82c6edbb71ef0cf95592a27e459fd49ac26de0e0f7b4c8cb4c721a1
font_01_sfnt_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 14712 bytes
SHA-256: f3c6316afe7a190975c5b28a9cf71fa8fad69e4f7ee830e919ce186d6b7e5463
font_02_sfnt_off000108e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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