Malicious PDF — malware analysis report

Static analysis result for SHA-256 f034628242dad953…

MALICIOUS

PDF

71.0 KB Created: 2021-03-22 09:31:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fc60d4f397a46bac72643ab2e133b5c0 SHA-1: a33239ebc8ecedb910a64461261c5f8a6de827be SHA-256: f034628242dad953751de34afad324738c898256c349376f4ee97c3ae340a07e
176 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent URL leading to a domain associated with phishing lures. Heuristics indicate it's a callback phishing lure, suggesting the user is meant to interact with the document in a way that leads to a fraudulent transaction or information disclosure. ClamAV detection further supports its malicious nature.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kuzutuzo.ru/award?keyword=accounting+information+systems+10th+edition+pdf PDF link annotation
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdfIn PDF document text
    • https://cdn.sqhk.co/furigelo/3jgQhjX/sisal_stair_runners_by_the_foot.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/cDgdjhG/boba_shops_open_right_now.pdfIn PDF document text
    • https://cdn.sqhk.co/lezebulodiw/hjjfLjd/tesepagozesarubevalobe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/903198aa-cf35-4a3a-b8ea-5e7600051c03/meade_etx-70at_accessories.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/rabujumuwetixa.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/xesax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8408634-2d73-444a-8f9e-b7cd934d411e/how_much_does_tomtom_app_cost.pdfIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_834977ad8ff14e889597fc5cdc25e6c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/lower_back_stretches_for_pain.pdfIn PDF document text
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_ea8ac24ba9064d9a8c44aa103fb785be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbcea021-aec8-43fc-a5a1-e4a35aa10294/why_wont_my_bissell_pet_hair_eraser_turn_on.pdfIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_2c887de0610349f2b4a58ad08f98f50f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d9fe0de-e87d-467b-95ad-2058e52ecc1d/forefikavo.pdfIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_f04423e865ed4b209fb5ee19a35761b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/gisevaxadiduzanaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2333e05-eb9e-44b0-b4f9-6c13d7da2bf7/is_primerica_life_insurance_expensive.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/rurekidawulabu.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_off0000d274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD274 5820 bytes
SHA-256: 7d125ab65c2daae4d4536ce8f1abd26a88e2449ebb4ec4cb77b91185412f3226
font_01_sfnt_off0000e62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62A 11460 bytes
SHA-256: 792932dc4e1f7c7e10fc63b417f824ed93226c251f08daed051206a1ddf34829

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