Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d84e8cb554f73b0…

MALICIOUS

PDF

89.4 KB Created: 2021-03-28 08:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 42e2e1ce5e0b22718cd1df6b470787d3 SHA-1: 9f183c5321d8dc96e10b6d83ea179d723293887a SHA-256: 2d84e8cb554f73b05c98f3597685a07041be185532c9fcc02f43c575fea6a0ca
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting or potentially malicious domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://botokaw.ru/strik?utm_term=does+walmart+sell+phones+for+verizon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410694/normal_5fd3362f67d89.pdfIn PDF document text
    • https://gedepaxu.weebly.com/uploads/1/3/1/3/131378821/jovimekipoku-nozezozojukut-xugelogazozuz-sawitavub.pdfIn PDF document text
    • https://pixokunotozonux.weebly.com/uploads/1/3/4/0/134017876/dudagasekurulu.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/jgA1Hgd/magnus_trainer_learn_train_chess.pdfIn PDF document text
    • https://balukisivirunuw.weebly.com/uploads/1/3/5/3/135312861/7889587.pdfIn PDF document text
    • https://cdn.sqhk.co/jopuromug/nDijgfc/avast_mobile_security_premium.pdfIn PDF document text
    • https://cdn.sqhk.co/viforoge/jiVhe8x/pojorotegi.pdfIn PDF document text
    • https://binenivav.weebly.com/uploads/1/3/4/5/134516867/sazodoxuvuvikes.pdfIn PDF document text
    • https://cdn.sqhk.co/jetirivotu/Dhcjjaj/candida_idsa_guidelines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481275/normal_5ff6cfb40ceee.pdfIn PDF document text
    • https://cdn.sqhk.co/revinoxu/Ehijhvs/dobumezapozerufexavo.pdfIn PDF document text
    • https://cdn.sqhk.co/votezevon/mS3qgf9/xarosusemexibebixevop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477615/normal_600c811cb6019.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/Aihcjj7/kowepuxekebelurefoveje.pdfIn PDF document text
    • https://rofupujo.weebly.com/uploads/1/3/4/3/134335987/senuruledis.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/tonemakopinibem/baccalaurat_en_informatique_uqac.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/constructing_probability_distribution_examples_and_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/les_mis_movie_ending.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/bemukol.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/sobilosatelu.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_off00011fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE9 5340 bytes
SHA-256: cabac71dd99be6438b75cf0bbdb2116df09a5b5ae84f96af582e2c78da1c3897
font_01_sfnt_off0001320c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320C 11236 bytes
SHA-256: 1f76237a7906843f6790d2aa0fdb7a6cdf46d9172e0edfda5fcf0f631db0f262

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