Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd42d1e5ed8ba0f7…

MALICIOUS

PDF

85.0 KB Created: 2020-11-25 19:17:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 736d64f99836f34eef7dbb223c510068 SHA-1: 3f30a8e4cddc3d944acd8cf0eec13f10704fd997 SHA-256: cd42d1e5ed8ba0f73226df04722c362aec4cb1a5778fece6738542eacda8fc35
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/strik?utm_term=o+brother+where+art+thou+sirens
    • https://bosamekuxukis.weebly.com/uploads/1/3/4/6/134672370/toboxobumeveli-dozib-mofaraw-falulixugopile.pdf
    • https://sixewamunid.weebly.com/uploads/1/3/4/4/134472099/6227339.pdf
    • https://porutopor.weebly.com/uploads/1/3/4/5/134515231/dezorefabubavudin.pdf
    • https://zigegawemofeza.weebly.com/uploads/1/3/1/4/131406932/zoguvo_buwini_ganuxox.pdf
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/tizedeniluxiz-gefowigujotubu-senunomikale.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/3c058a2c-d77a-4364-a7a7-0b2f75c28d06/8943456514.pdf
    • https://s3.amazonaws.com/zuxadol/69748389509.pdf
    • https://uploads.strikinglycdn.com/files/1312ff15-698f-48d8-8aae-10a971aadaa7/red_heart_team_spirit_yarn_patterns.pdf
    • https://uploads.strikinglycdn.com/files/8508d30c-58f9-4f3d-bf8e-b31d1ef5cc34/waxanakoniziluzenidop.pdf
    • https://s3.amazonaws.com/joterige/tozomojovefunukore.pdf
    • https://s3.amazonaws.com/bunobu/vizio_e48_c2_specs.pdf
    • https://s3.amazonaws.com/nafoxuda/6568529856.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001016b.bin
e2d0c417c9cbcf37c0a84aabac3eff0987fc5f8f2e0bd106cfba9427c89f7e2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 4880 bytes
font_01_sfnt_off00011209.bin
1850c3f70479a580582af90d5f057b29a753a2d3ba1c5e764f51aabf69342057		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11209 11400 bytes
font_02_sfnt_off000138e9.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138E9 4324 bytes

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