Malicious PDF — malware analysis report

Static analysis result for SHA-256 159ec571a54cab2f…

MALICIOUS

PDF

71.9 KB Created: 2021-06-02 00:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: bfe686673d8e822d4bead3092db4d653 SHA-1: 528073ce061c0cdfbe21ad56509491a6c553eb04 SHA-256: 159ec571a54cab2f0a4645b873839a33b4991512ad56e9417d83995a2da38057
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links, such as 'https://coretry.ru/pbw?utm_term=ganong+physiology+book+pdf', are likely part of a campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://coretry.ru/pbw?utm_term=ganong+physiology+book+pdf PDF link annotation
    • https://vunusamonumated.weebly.com/uploads/1/3/4/0/134040658/8912354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488314/normal_60232c89bf16d.pdfIn PDF document text
    • https://ponokexagetax.weebly.com/uploads/1/3/4/3/134326843/pexomus.pdfIn PDF document text
    • https://puvugemamoj.weebly.com/uploads/1/3/0/9/130969199/pipowutun.pdfIn PDF document text
    • https://fulafokowezoje.weebly.com/uploads/1/3/4/3/134384829/zububevatuwud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_6030ad95b4000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375195/normal_6024539176255.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413002/normal_5fde841029146.pdfIn PDF document text
    • https://vavawuzozut.weebly.com/uploads/1/3/1/1/131163550/xaledekumurumojibu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f143850-09e4-466f-9f31-e5427f9bc7e4/craftsman_table_saw_model_113_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/507b0e71-8e11-4dad-8319-022e8c2aa5b1/7384613916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89be0141-eac6-45a5-ae75-650dd623da64/sosutugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efd1b4c4-423a-452e-9eea-d0f2af58a9f2/zubanunimomilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e79bc3c3-00e2-4797-8e15-c58cafbe0c3b/36814357460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15be3717-a433-4a1a-ad11-d8ac4fe19149/56393930728.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_off0000d968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD968 5544 bytes
SHA-256: 5e59fef85c9a72ff43b356eaeb005c965ab1e2d583260c94dbcb3f3536139d41
font_01_sfnt_off0000ec4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 11316 bytes
SHA-256: eb7961640b5e3d0ce0180baa7bcd22117b383c6d3a89f68ce7bec72b439d6ac7

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