Malicious PDF — malware analysis report

Static analysis result for SHA-256 193ee09780809dee…

MALICIOUS

PDF

84.2 KB Created: 2021-01-13 17:45:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c21a404a9ade26bd7d71883bc0f0c43f SHA-1: 1c4331f4e5b242154fdc9c9a4818190aabd3e894 SHA-256: 193ee09780809dee8f0f4bafeca7ac6b49d6be876d078b3cae0aae8d36a0214e
184 Risk Score

Malware Insights

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

The PDF file contains embedded links that point to known malicious redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document's content, though heavily obfuscated, appears to be a lure, possibly related to an instruction manual, to entice users to click the malicious link. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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/123?utm_term=gopro+hero+4+black+instruction+manual In PDF document text
    • https://static.s123-cdn-static.com/uploads/4369163/normal_5ff7c65d2c0c4.pdfIn PDF document text
    • https://site-1171522.mozfiles.com/files/1171522/escape_the_mansion_minecraft_map.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/wusepojajovoziv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393363/normal_5fee9cb16b134.pdfIn PDF document text
    • https://wiwawuvagowe.weebly.com/uploads/1/3/4/4/134496439/e301a.pdfIn PDF document text
    • https://site-1173562.mozfiles.com/files/1173562/ted_danson_age_on_cheers.pdfIn PDF document text
    • https://muzaromiv.weebly.com/uploads/1/3/4/3/134380281/1768876.pdfIn PDF document text
    • https://site-1176752.mozfiles.com/files/1176752/raiden_finishing_moves_mortal_kombat_x_ps4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dekogamik/15580605370.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/beep_beep_sound_effects_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/amanda_black_amazulu_album_zip_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/multivariate_probability_distributions.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/balance_sheet_of_any_manufacturing_company.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/free_living_will_template_florida.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C25 5496 bytes
SHA-256: 92ab889ea99beab706d3d1acde5948580054289e3a721235848a3069d9da2820
font_01_sfnt_off00011eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAF 10768 bytes
SHA-256: 058cc297c656c56b8dde61f82c6476b5212edc8dffe617a2aab9ff0867ac6460

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