Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c511302c59a084…

MALICIOUS

PDF

72.7 KB Created: 2021-03-26 08:43:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e8705dd8809f84aef51aaa57dc1ec381 SHA-1: 2bb7200a52d4e499f1c6a1fb60237e94f4244ae9 SHA-256: 58c511302c59a0841239a17d50edc6b8b77661abc124f5a4a68db6c547d6d7f2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, suggesting it functions as a link farm or a phishing lure. The presence of `utm_term` parameters in some URLs further supports the idea of tracking or directing users to specific content, potentially malicious.

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://gimoguvi.ru/123?utm_term=guide+guinevere+tersakit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387702/normal_6047de592d4cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_6027f81704e73.pdfIn PDF document text
    • http://salogogudezofa.iblogger.org/dulekogagenufuvuje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_6018d43cdae80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465938/normal_602ac3e5a5144.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459329/normal_5fc68e3fe0126.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410989/normal_5fc960fa8c03d.pdfIn PDF document text
    • https://torosiwetub.weebly.com/uploads/1/3/5/3/135351177/wogil_ruroxudosen_topaludo_wugojexalej.pdfIn PDF document text
    • https://dinidoleto.weebly.com/uploads/1/3/0/9/130969871/kuneganezejope-vuxusira-teloxibelirimop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401732/normal_5fee8bfe9d894.pdfIn PDF document text
    • https://kapizufon.weebly.com/uploads/1/3/4/4/134486886/8f88fffcf0fb.pdfIn PDF document text
    • http://mavavuvew.22web.org/activity_comparing_c3_c4_and_cam_photosynthesis_worksheet.pdfIn PDF document text
    • http://sipidasurow.22web.org/375213365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503035/normal_6048ab5a85886.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noderukun.epizy.com/36689706047.pdfIn PDF document text
    • http://fanolegib.rf.gd/gear_cutting_tools_fundamentals_of_design_and_computation.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_off0000e072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 5116 bytes
SHA-256: 1511f8ad30b75ffa2fff6a28e4872c48ec9a218b6ed77f317cebe5b758006e43
font_01_sfnt_off0000f1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FD 10508 bytes
SHA-256: eaab2b256dd5b2b18f396dd2eddb9a80fff96b8af65df22b93a0312f8a8206b9

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