Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebdf37e470e5bde6…

MALICIOUS

PDF

71.5 KB Created: 2020-12-08 07:50:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ce570532fe90ed61b4989414027a486 SHA-1: 98ef9d4f9b55ebd725ea22396335f035f3be6a67 SHA-256: ebdf37e470e5bde6180cf207d82c0538d51c3e484fbcc50d750001e3d97c6e40
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm or SEO spam operation. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious or spam content, likely delivered as a phishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/strik?utm_term=how+to+plot+3d+in+mathematica
    • https://vedemolo.weebly.com/uploads/1/3/4/7/134702866/edbb97688c93.pdf
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/vubadevudi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0d604784-3d0d-4259-b43d-081076940544/luwevivowabasixunebubi.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe07543f75b166439c20be/1606289236981/all_the_wrong_questions.pdf
    • https://uploads.strikinglycdn.com/files/80d3b121-4d7a-4816-bc12-216986f10643/honda_element_roof_rack_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/a579b832-d7fc-4701-a935-f594a40412bc/xem_phim_chuyen_tinh_co_giao_thao_vi.pdf
    • https://static1.squarespace.com/static/5fcdeb25f1fc5b0afda748e3/t/5fcedc72faf0bc04d1bbbcdb/1607392381214/nerediwimajosi.pdf
    • https://uploads.strikinglycdn.com/files/1623e910-4148-4d19-9b27-6b1e877d6c5b/32988667391.pdf
    • https://uploads.strikinglycdn.com/files/c8f5eec0-a9be-4864-850d-97c08dbe6b7e/matco_mc200_manual.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf080cc750a3b5a04eed4/1606217857485/political_geography_definition_oxford_dictionary.pdf
    • https://static1.squarespace.com/static/5fc4c0851c8c7413144aa908/t/5fc59ad65147b14804f387ff/1606785756537/answer_me_in_german.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf9679ee0f32b871984a3/1606285672076/bezajamumudulazudibit.pdf
    • https://static1.squarespace.com/static/5fc5925716f6d44b07de45cb/t/5fc6cbef5fecd2174b4a8e9b/1606863856651/the_sandwich_spot_palm_springs_california.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf93172f8b574a0f31777/1606220081673/51800030380.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_off0000d75b.bin
a788a5cb1c9685b8a468e34b7dc641b5b0df8302d8b810c4ccb00d558047cc39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 5256 bytes
font_01_sfnt_off0000e929.bin
39df68b975a4b3836ca3d5039360acd267f00845f4233a0e90a94e708643229e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 11680 bytes

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