Malicious PDF — malware analysis report

Static analysis result for SHA-256 683abfbc27df4046…

MALICIOUS

PDF

70.4 KB Created: 2021-02-18 15:31:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 39ed4b54ab13ec47f41cb598db8190a1 SHA-1: 6afd3cba6f99a12198a8ae39e9a4fcaeeaf8a06a SHA-256: 683abfbc27df40465e61de88701a0bd0a2c8afab724da38797ba4a9140153c66
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm designed to manipulate search engine results. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=roomba+880+error+codes In PDF document text
    • http://ukranews.site/gram_staining_download2tti4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377371/normal_6020a51dc5a92.pdfIn PDF document text
    • https://fodolirikixubug.weebly.com/uploads/1/3/5/2/135297927/ribezoloke_gunujesaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482426/normal_5fe78850ba0e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471985/normal_602e30f81e826.pdfIn PDF document text
    • https://bavopasivivewid.weebly.com/uploads/1/3/0/7/130738836/2e23ae0bd27.pdfIn PDF document text
    • http://gnfcns.info/57719384883ijvhm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_5fd84c079ff74.pdfIn PDF document text
    • https://gatepeduvemixif.weebly.com/uploads/1/3/4/6/134669895/f73bdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486033/normal_601a522097011.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498404/normal_5ff2801ea20cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391642/normal_6010a44575666.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/gafedupeba/mental_addition_worksheets_year_3.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/monibitamekeluxuzeziles.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_off0000d533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD533 5536 bytes
SHA-256: 9487a1f6bffba1ac733cf3ac9159933b7871ae996c0ce2b7d28fd1f8f032d386
font_01_sfnt_off0000e7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 10908 bytes
SHA-256: 4ce79ecce9f9d9f52524d3fcc2ffc038810315e8f51f4e363364fe5b9973cac1

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