Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ce1430228d969d…

MALICIOUS

PDF

65.8 KB Created: 2020-11-25 11:33:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56666cce21c2166e547821ec722e4266 SHA-1: 1b084e31bd0e5b19b3acbb669168c26912caa823 SHA-256: 03ce1430228d969d851a0ff4ddaef5edf8529e145135e67a65a0e1350ac52c35
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of a link farm, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it is used for phishing or distributing malware. The embedded URLs likely lead to malicious content or further infection vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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://traffine.ru/123?utm_term=jersey+shore+season+4+episode+7
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/mekoguronapida-mawen-kazozevuvuvekab.pdf
    • https://cdn-cms.f-static.net/uploads/4411001/normal_5f97cdfa1501c.pdf
    • https://cdn-cms.f-static.net/uploads/4370052/normal_5f956fd88a700.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9a982de9-a9d7-403d-ae8c-653419bc920a/mujinup.pdf
    • https://s3.amazonaws.com/xakajoziwibi/chingamasam_vannu_chernnal_remix_song.pdf
    • https://s3.amazonaws.com/sevoga/scratch_programming_lesson_plans.pdf
    • https://s3.amazonaws.com/zalomi/44776759509.pdf
    • https://s3.amazonaws.com/wivunonovef/age_of_empires_android_offline_apk.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_off0000c3f0.bin
0b995039355db4f8bdf267e4e66490c15f7b771a0a8c2df0232b3816157fad83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F0 5272 bytes
font_01_sfnt_off0000d5ec.bin
7c506ccc5d301051f44501c5abbe8d6fa137528bf717d2a238ff2828b520698c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EC 10816 bytes

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