Malicious PDF — malware analysis report

Static analysis result for SHA-256 5085f31ebc408843…

MALICIOUS

PDF

295.4 KB Created: 2021-01-05 21:11:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ee4d32e079c5f53e81a5356ddf6e93eb SHA-1: c32931c4e39f302927a2b5501e325866298a9834 SHA-256: 5085f31ebc408843f81b77a9d5bc9b415eb08661af5e03c0cabc27527e215221
154 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also strongly flagged the PDF. The embedded URL points to a suspicious domain, likely used to host or redirect to malicious content. No scripts were extracted, but the PDF structure itself contains the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffine.ru/aws?utm_term=aua+guidelines+surgical+management+of+stones In PDF document text
    • https://cdn-cms.f-static.net/uploads/4500425/normal_5fe759af5c6bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476578/normal_5fb320306a56a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443819/normal_5fa6f885c50f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5fb33a8452490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448347/normal_5fd7bf8f81897.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408863/normal_5fcd87388f2c7.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/10c79fdc-b780-4d12-8e28-76096fb12758/il_parait_que_subjonctif_ou_indicati.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/96598908013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68e356c3-8266-4431-9d58-2f275b88b9e5/download_crt_video_geometry_calibrator_dvd.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/80552722860.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/chicago_mayoral_election_2019_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/asus_pc_performance_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6985a8ec-1e70-43ea-a199-2c1997e73c91/puvofaped.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/tipos_de_afrontamiento_del_estres.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00041ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41AB0 18380 bytes
SHA-256: 9284821062e0c4a367320cfe28170c9673eb83007f6b575514cd5d41dbc74d80
font_01_sfnt_off00045160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45160 5328 bytes
SHA-256: 91ad8c278bbadc34057824e31e1107d90ef731de8a4b61d840ffe294151d9361
font_02_sfnt_off0004636e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4636E 12840 bytes
SHA-256: 1a6d3769f861a1e356c01dc5606a01817f7e1d98102eae0dda2a5ebc5271d646

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