Malicious PDF — malware analysis report

Static analysis result for SHA-256 b730ff233fca7d68…

MALICIOUS

PDF

134.4 KB Created: 2021-03-25 00:13:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 181043f6243c3fd2d12d2f4fe12fa23a SHA-1: bfb23e987871eac07a8323ba9a0c05cb71e5010d SHA-256: b730ff233fca7d6881da27e72ec206a8512f048eb8201dfea0b1081a143d6c5a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The document body, though heavily obfuscated, contains references to game walkthroughs and application metadata, suggesting a lure. The presence of numerous external URIs, some hosted on disposable domains, points towards a phishing or malware distribution scheme.

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 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.
  • 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://lozipotod.ru/wix?keyword=mega+man+battle+network+3+walkthrough
    • https://cdn.sqhk.co/punipopi/iagdghl/emojis_new_stickers_for_whatsapp_wastickerapps.pdf
    • https://cdn-cms.f-static.net/uploads/4456122/normal_60504fd8ae125.pdf
    • http://givupuxorow.iblogger.org/hoover_steamvac_dual_v_parts.pdf
    • https://static.s123-cdn-static.com/uploads/4415073/normal_5fee7ff234137.pdf
    • http://zunugopubudo.22web.org/pewosavigare.pdf
    • https://cdn.sqhk.co/dalegoti/ahbgjVO/23501785880.pdf
    • https://cdn-cms.f-static.net/uploads/4447098/normal_6025ce84ec2f5.pdf
    • http://tegisuro.22web.org/23697173420.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tamefizorala.epizy.com/91958471107.pdf
    • http://jijetesak.rf.gd/why_is_parallel_structure_important_in_writing.pdf
    • https://uploads.strikinglycdn.com/files/ee1d3e7d-08ea-40ea-a901-da98f0d05a95/543411692.pdf
    • http://mazizinopuki.rf.gd/vocabulary_from_latin_and_greek_roots_unit_two.pdf
    • http://niwapixezir.epizy.com/prayers_to_say_when_someone_dies.pdf
    • http://mobosusewet.epizy.com/wofajoxufefaziranijatov.pdf
    • https://uploads.strikinglycdn.com/files/52f26241-49ee-497d-a1d5-738838357087/pepevaloxe.pdf
    • https://uploads.strikinglycdn.com/files/6e40046f-9274-469d-b64c-b79d312e4753/69126138563.pdf
    • http://lugaderova.epizy.com/gabbys_dollhouse_characters_toys.pdf
    • https://uploads.strikinglycdn.com/files/f0bcdf48-c768-4ad9-a57e-f266686c6c59/buzukanofaxoxotafuwuki.pdf
    • http://nerokigonone.rf.gd/easy_english_words_to_learn.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_off0001d27b.bin
b65ca77e2aebc354873be645c803dac5043966e1f7482a64fc21d5a162cc9911		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D27B 5388 bytes
font_01_sfnt_off0001e4c6.bin
f3f427f99608a571913d3d1fec4544794fd110edbd544dfd3fcb93fef5bc0d31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4C6 11408 bytes

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