Malicious PDF — malware analysis report

Static analysis result for SHA-256 a392bd4373dad117…

MALICIOUS

PDF

76.1 KB Created: 2020-12-02 23:04:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c3052f4a92a67c85a2c827dd7013e065 SHA-1: d23c2bda2d3fa5d504163b341a13eaa5c6b2dc3d SHA-256: a392bd4373dad117fd0d31d1d83d53b172a3bd427f9da35eedbf8c94e712bae1
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, includes text related to 'school closings tomorrow', suggesting a lure. The presence of numerous external PDF links, some pointing to benign content and others to unknown domains, indicates a link farm or redirection strategy. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/strik?utm_term=wbng+school+closings+tomorrow In PDF document text
    • https://naletonuve.weebly.com/uploads/1/3/4/3/134381452/jufizatilav_fuzek_vepaxetevikene_fasitanelepa.pdfIn PDF document text
    • https://vejurinunabesud.weebly.com/uploads/1/3/4/7/134705678/wonakowuvamak.pdfIn PDF document text
    • https://gosikemimikivum.weebly.com/uploads/1/3/4/6/134674661/70c7a.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/c7896d92-acb7-49ef-8f84-a0f90539d352/lajadinod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d497db1-84b0-4c33-a679-da97fcf953a4/duzowugodovugev.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc550135bcb0228a29fc239/t/5fc647c89b1ed03538b369da/1606830025564/futabitewagoguvime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/497085f8-3dee-40c0-a6bb-a2fa88649194/5x_plus_size_clothing_wholesale_canada.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b069403f5353fdb64a54/t/5fc6da0eb2fa4660c8c263f5/1606867471800/clinique_city_block_purifying_charcoal_mask_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89423d8a-d115-43e6-b12a-1cc4e57042ad/adverb_definition_grammar_examples.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf9888bc8713fe6fd8379/1606220173322/rc_jet_planes_ready_to_fly.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3690c2e537a05ef19187d/t/5fc5f14518e72e5fdba46a0c/1606807878442/the_death_of_the_ball_turret_gunner_randall_jarrell.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfcaad334513fae422692/1606220970746/32177935855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eafdba5a-34ff-4d24-9ee1-777555e09cab/56697652612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5a10881-bafb-4d64-8f0e-b697df19946b/73009492225.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C7 5248 bytes
SHA-256: 52fcfa8095725e521e6f59b91c1ebb717393eaa03e6657fae52e30e1484429a4
font_01_sfnt_off0000ea99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 10308 bytes
SHA-256: b79ef27df85112f34487d029048baa356c73909c47b0bcb3c084b96f5681b4de
font_02_sfnt_off00010dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC4 16244 bytes
SHA-256: 5bb6d287f328d473a295550345f347f13bbb250302583c780c9d4aba250cb6f1

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