Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f6f5ace91170cc…

MALICIOUS

PDF

77.7 KB Created: 2021-03-26 04:37:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8babc5795ca9db154ed6ef03e1eeb7f8 SHA-1: e3d6aef10f9e413b5e26c68e460b7e3782cd2c39 SHA-256: a2f6f5ace91170ccc1e743bca582e1ed1390cb08d370a05269739b560e556373
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing and trojan threat. It contains a large number of embedded external links, many of which are likely part of a link farm designed to direct users to malicious sites, as suggested by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily garbled, appears to be a lure related to a "Tower garden manual", and the presence of external URIs points to the document's intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jumiwimov.ru/wix?keyword=tower+garden+manual
    • https://cdn-cms.f-static.net/uploads/4449775/normal_6027dd53bc45e.pdf
    • https://cdn-cms.f-static.net/uploads/4458417/normal_601ad2c3576ad.pdf
    • http://urolog.xyz/how_does_justice_help_societyuxwzu.pdf
    • https://cdn-cms.f-static.net/uploads/4484806/normal_6034e98be91e7.pdf
    • https://cdn-cms.f-static.net/uploads/4450907/normal_601dff4bc61fc.pdf
    • https://cdn-cms.f-static.net/uploads/4475866/normal_5fdad1962e868.pdf
    • https://lenopeseku.weebly.com/uploads/1/3/4/0/134040497/gaxomizufopefa-tadari-lejemif-nuxunanu.pdf
    • https://denonifo.weebly.com/uploads/1/3/4/7/134709080/wunumabulizo.pdf
    • https://cdn-cms.f-static.net/uploads/4502439/normal_6056772187a7d.pdf
    • https://dotofinadi.weebly.com/uploads/1/3/0/7/130740455/zetakezoxilini.pdf
    • https://zejasuvosoropaj.weebly.com/uploads/1/3/5/3/135345482/3036537.pdf
    • http://digitaltoolsfor.xyz/how_to_shoot_from_a_deer_standmrrdg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_6d6cdc8c036140e0ac7b03ce156d6c2c.pdf?index=true
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_0bf876ce46f0481ca7c48fd21cf3ed20.pdf?index=true
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_c11df67740454730886842cf25948f7b.pdf?index=true
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_7beaf1da32f248c7b1209da97951e438.pdf?index=true
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_b133335af82f4109847012f381017483.pdf?index=true
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_a0eb5d4182e549c68e1e646dba88591a.pdf?index=true
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_bbc4192c303949759c9f4f2cf86332fc.pdf?index=true
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_bd9aa941dc8745639bba7c07dd0fcf27.pdf?index=true
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_682fc4d00c254d04b7471a88f5c206a0.pdf?index=true
    • 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_off0000f0cf.bin
4bb9fc671de8eea3fc5b902ece7f92a80d11927ae89e9d14d17789e0917c478d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 5008 bytes
font_01_sfnt_off000101d4.bin
b816512a08e8b19b7fa1c9d7d92c4c0900ed530add8f5816c4702c0b66a61237		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 11180 bytes

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