Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5720460eab1db7c…

MALICIOUS

PDF

65.6 KB Created: 2020-11-20 04:13:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ac1dae4e650d5759a0d29a9a0b545654 SHA-1: d444bb15972a4bda9c8ee8ef838e6b2a80a83d54 SHA-256: e5720460eab1db7c3fe0948113ca59d6087a3fca8241798b00062f55352e3d9c
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to link farms and known malicious redirectors, indicating a phishing or malware distribution attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly suggest this malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffmen.ru/aws?utm_term=id+card+template+school In PDF document text
    • https://voxepobar.weebly.com/uploads/1/3/4/6/134668427/besedegik-wegewegewefo-weganitejiwes-muwubofetosid.pdfIn PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/vusezeber.pdfIn PDF document text
    • https://befepoli.weebly.com/uploads/1/3/4/6/134687110/9587615.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/vuzigojokefodi.pdfIn PDF document text
    • https://zemezomar.weebly.com/uploads/1/3/4/7/134711889/dinikadozafef.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/sojigedatutibibibagi.pdfIn PDF document text
    • https://jowoxivodatut.weebly.com/uploads/1/3/4/8/134851862/f3dc82.pdfIn PDF document text
    • https://murikupa.weebly.com/uploads/1/3/4/4/134481598/motatasokik-lowise-loxexurodajob.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/kibavutibeved/tifamizisevusewinilulob.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/opioid_withdrawal_symptoms.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/flash_browser_android_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/thriller_lyrics_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b62681e7-82d1-404b-8bc8-4110379c1ddf/26771188823.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_off0000c5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F3 5248 bytes
SHA-256: d430a360d101e781d8d01d38479bb230c10d6e176057f146cb90c5d04235f9b6
font_01_sfnt_off0000d797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD797 10204 bytes
SHA-256: 4155eb775314649eba530fb95401d9a4982a0b6e912a88d437ce04a64f809278

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