Malicious PDF — malware analysis report

Static analysis result for SHA-256 768199beaa25586d…

MALICIOUS

PDF

96.6 KB Created: 2021-05-08 02:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c3036cc2fbe51cd82c2a26ffec529915 SHA-1: 204bc2540b893029c13b7e8c07101e722605ff06 SHA-256: 768199beaa25586d08924df92fc6400aa436fd5596770af11277ae196fd3417b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this. The embedded URL and the ClamAV detection further confirm its malicious nature, likely serving as a lure 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
  • 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.
  • 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://vilenefex.ru/strik?utm_term=facebook+help+number+australia PDF link annotation
    • https://cdn.sqhk.co/xawodoze/ihiguPT/dalugugusepu.pdfIn PDF document text
    • https://jeratevi.weebly.com/uploads/1/3/0/7/130774970/394968.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/Od2Opjc/524594750.pdfIn PDF document text
    • https://cdn.sqhk.co/luginuwi/jieg5ie/tufozevisirobifozosexun.pdfIn PDF document text
    • https://ramorebuba.weebly.com/uploads/1/3/4/8/134898890/3710839.pdfIn PDF document text
    • https://boliwarabinobe.weebly.com/uploads/1/3/1/4/131437394/mebopanisefara.pdfIn PDF document text
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/majefelu.pdfIn PDF document text
    • https://cdn.sqhk.co/gojelonub/jgrjc78/zuvofodoveju.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/OVPgjdC/best_free_movies_app_for_android_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/evuhbjh/arctic_wolf_habitat_map.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinipaz/jaaNGIm/gold_and_silver_prices_per_ounce_monex.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuviju/VEgd7X1/50446700351.pdfIn PDF document text
    • http://sirunome.mypressonline.com/bopisevarunedejonafipepex.pdfIn PDF document text
    • https://cdn.sqhk.co/lukavago/ihhhibV/fekasoxidadadufenep.pdfIn PDF document text
    • https://cdn.sqhk.co/gixegusu/HhhEuhg/filobuziwokowivip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wudazebej.atwebpages.com/courtesy_call_letter.pdfIn PDF document text
    • http://ledufowi.myartsonline.com/sekegajufekeriwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f163fc0d-58e1-4936-9ad0-5745cf0982dd/puniximabuzad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7895ed-a849-4436-bb93-41c0e7a35ee1/safeline_metal_detector_test_pieces.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a572a8dd-6a07-4d31-a4fe-5e40fb32ed5a/zimikinawuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/775faa3f-bab0-47e3-b880-5b995fe53a43/suwapepem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea0e3222-7f5a-44f9-a129-fc957bafaddb/vukiwizusafuvezejesixose.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_off00013d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D76 5332 bytes
SHA-256: 3a571294aa6bca4f588bc45ebb6ba26d64be2e871a817729b62f3da8b1bfa9c3
font_01_sfnt_off00014f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F69 11604 bytes
SHA-256: 2de5f37698e591febd37f88914e83aca644fcb7a3454c59b7954002d8be4089a