Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3d79e29ab501c5…

MALICIOUS

PDF

78.4 KB Created: 2021-01-12 06:40:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8d6f48a28990b8b73eb0a233e555d414 SHA-1: 46458087e8ea4cd0cd2fa3a3a81d829817a10443 SHA-256: 9a3d79e29ab501c5ecf77e226b43372bf5e8d7d2dbec6e71bdc92e873c6a14f6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to video game guides, which is a common tactic for phishing or malware distribution. The presence of external URIs indicates an attempt to redirect the user to potentially malicious content.

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
  • 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.
  • 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://traffset.ru/aws?utm_term=dead+space+extraction+trophy+guide+and+roadmap PDF link annotation
    • https://site-1201024.mozfiles.com/files/1201024/final_fantasy_16_ps5_date_de_sortie.pdfIn PDF document text
    • https://site-1166617.mozfiles.com/files/1166617/69158776767.pdfIn PDF document text
    • https://site-1176088.mozfiles.com/files/1176088/folder_sync_pro_2__9__16_apk.pdfIn PDF document text
    • https://site-1224368.mozfiles.com/files/1224368/34687018073.pdfIn PDF document text
    • https://site-1243731.mozfiles.com/files/1243731/kegabiri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_5f96efe5bf853.pdfIn PDF document text
    • https://site-1175991.mozfiles.com/files/1175991/surf_dragon_boat_racing_2020.pdfIn PDF document text
    • https://site-1191111.mozfiles.com/files/1191111/how_to_get_edmodo_class_code.pdfIn PDF document text
    • https://lejonajij.weebly.com/uploads/1/3/4/6/134651266/1347911.pdfIn PDF document text
    • https://site-1083673.mozfiles.com/files/1083673/dekifonavute.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/Giehiij/43462013533.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/bomupi/2725539428.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_off0000f58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 5624 bytes
SHA-256: 9af67a8b3087c86876ed116ac9f8ea87fbcbdadde44c629027be34708b4f5701
font_01_sfnt_off0001089a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 10472 bytes
SHA-256: 2dbfe9fa30d7a84a4f00fcb75e0799cd19bbe5ff51ae62ed5bb74c2c2340a910

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