Malicious PDF — malware analysis report

Static analysis result for SHA-256 1167171637341330…

MALICIOUS

PDF

76.1 KB Created: 2021-01-12 11:05:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 280f2eb3e23c51b97a95bccc8985ab68 SHA-1: 175396355e84cbaf31f0b478f5e864e7a4f70d7e SHA-256: 11671716373413308b89a68784374a62ba6167ee40fdf6cc3e7838442690e243
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a PDF SEO link farm. The embedded links, such as 'https://cctraff.ru/123?utm_term=gw2+artificing+crafting+guide', suggest an attempt to direct users to potentially harmful content or phishing sites. The ML classifier and ClamAV also strongly indicated maliciousness, supporting the classification as a phishing or redirector-based attack.

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 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://cctraff.ru/123?utm_term=gw2+artificing+crafting+guide In PDF document text
    • https://static.s123-cdn-static.com/uploads/4500429/normal_5ff3adcee6619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413719/normal_5fbf59db867ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406228/normal_5fcb592847c16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446759/normal_5fa6eb9c85bf3.pdfIn PDF document text
    • https://site-1177895.mozfiles.com/files/1177895/fizz_runes_aram_s9.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvomuvugu/eAF9hgx/alarm_clock_radio_bluetooth.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/4pdGT3O/set_wheel_size_bike_computer.pdfIn PDF document text
    • https://site-1166598.mozfiles.com/files/1166598/57058554052.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/nagebupuma-dolozup-vitekiwigebafej-viniwej.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/idRigjg/kowevegeremi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485313/normal_5fac2343dfe1d.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/S9gchgc/16493267461.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CC 5236 bytes
SHA-256: 330212343478b5a01f3b4506a167bd8fb886f731fef2ba031ced03a724c1ebf5
font_01_sfnt_off0000eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 10412 bytes
SHA-256: 73504282b59cc3b8784c85dce61d87bd523079d481e1c9b6b9bf42645e5d520c
font_02_sfnt_off00010e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9E 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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