Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6bc5ac8a58e7b7…

MALICIOUS

PDF

81.3 KB Created: 2021-03-18 03:19:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3653372d518c3e028e0e4e9adfe774f0 SHA-1: daefc4d6594aa03ea5fe0f4be2d94102a4d04295 SHA-256: 7f6bc5ac8a58e7b7753d42f1b38b8cec50cacbc92a71a55a859dba4048338fc7
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a phishing lure. Heuristics indicate it's a link farm on disposable hosting, and ML classifiers and ClamAV confirm its malicious nature. The document body, though heavily obfuscated, contains text related to 'playing card games rules pdf', likely a pretext to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://baarspo.ru/award?keyword=playing+card+games+rules+pdf
    • http://kopalirigel.mypressonline.com/bimumobirunetomuveka.pdf
    • https://static.s123-cdn-static.com/uploads/4402478/normal_5ffb6b8d9a28d.pdf
    • https://vonorakukipi.weebly.com/uploads/1/3/4/7/134721252/8d23447.pdf
    • https://cdn-cms.f-static.net/uploads/4387218/normal_6031e408004a7.pdf
    • http://skout.tech/manual_assembly_line_adalah791ts.pdf
    • https://xomivevisavuwog.weebly.com/uploads/1/3/4/8/134852088/mavasokulezowa.pdf
    • https://static.s123-cdn-static.com/uploads/4385009/normal_5fee173c8402f.pdf
    • https://static.s123-cdn-static.com/uploads/4481273/normal_600025691323c.pdf
    • http://center-san.ru/when_will_twilight_breaking_dawn_part_3_come_outhilwd.pdf
    • http://pivolirarorip.mypressonline.com/28066780754.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tapoloferazuziw.atwebpages.com/doxiguremejikoxavodax.pdf
    • https://s3.amazonaws.com/jobavo/time_charter_party_form.pdf
    • https://s3.amazonaws.com/jepavilutabilel/2018_standard_deduction_worksheet_for_dependents.pdf
    • https://uploads.strikinglycdn.com/files/a39e35df-045d-4b50-b54b-6645d520616c/89657090373.pdf
    • http://jotudokizer.onlinewebshop.net/accelerated_c_practical_programming_by_example_1st_edition.pdf
    • http://juvusowupu.onlinewebshop.net/50871682847.pdf
    • https://s3.amazonaws.com/debamijizozexo/taenia_pisiformis_life_cycle.pdf
    • https://uploads.strikinglycdn.com/files/1e6bfa67-a103-4ad4-8091-8e316f903c48/loxezipagolisofonaluto.pdf
    • https://uploads.strikinglycdn.com/files/7c03e48a-8310-427f-b66e-f43f818d5bfc/what_is_the_molar_mass_of_3h2o.pdf
    • https://s3.amazonaws.com/latufenaw/91794091487.pdf
    • https://uploads.strikinglycdn.com/files/1762db06-db52-42c0-88f0-4f77e85ba502/how_to_describe_a_frozen_lake.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffb3.bin
2626c935530dbc74959e862472f981a5cda5cb03c4c73196ba1d10d24ebe820a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 5576 bytes
font_01_sfnt_off000112a4.bin
67321345e86ad68f0ae799e53b3c212b5c19979a7cdc5a6ed81695145243e8f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112A4 10580 bytes

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