Malicious PDF — malware analysis report

Static analysis result for SHA-256 857ebeb7a346adfa…

MALICIOUS

PDF

70.2 KB Created: 2020-11-25 04:30:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6827c4aa4cf989ceff6eabfbd5d6f474 SHA-1: e1400711a77f3f1d2e7dfbcd4ff02a918754111c SHA-256: 857ebeb7a346adfac273b249c7a8d05394c8679ba0cd51b3ceba4b4720ef4e4c
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection to malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at `https://gettraff.ru/strik?utm_term=piano+keys+cheat+sheet`. The ML classifier and ClamAV also strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/strik?utm_term=piano+keys+cheat+sheet In PDF document text
    • https://maminimavuzi.weebly.com/uploads/1/3/4/6/134640728/634f72.pdfIn PDF document text
    • https://toziraza.weebly.com/uploads/1/3/4/5/134506396/64e1870b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444113/normal_5f9f4169b8251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_5f885724a9dfd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nowokil/swtor_class_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/fashion_illustration_croquis_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/8762934176.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/32171904542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc0b401e-182f-4106-acb0-f430758891b0/wopojexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ce4eb5-b667-4d74-a29d-f0d4902b20d7/wexetukewitodofoxuritusex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e1f8a14-a32f-4a01-9130-0d5941aad84a/63658389188.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDB 4716 bytes
SHA-256: 06b5e9dcc7c92e5a1020226303130dd6d52ed57a30e05565c05708f69e0aed73
font_01_sfnt_off0000dbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDC 10148 bytes
SHA-256: d866e99ae449ecc70925ee4149df4f82df13c28c6860b112fa3cae88d33f0106
font_02_sfnt_off0000fe86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE86 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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