Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44f763f683a9109…

MALICIOUS

PDF

74.7 KB Created: 2021-02-16 09:46:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4b6ec79d8a5c97e6d70796fc48918085 SHA-1: b00a96c8b4413d14498cf5183d314af65a7dc284 SHA-256: f44f763f683a9109beba0e87aea4a6c769cb19eb6392f8fdf515a315661af6ad
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

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
  • 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://druttle.ru/strik?utm_term=is+the+class+b+cdl+written+test+hard PDF link annotation
    • http://copyrightsupportforlnstagram.com/volokurivaxiwuzix5tsx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382201/normal_5ffac027191cc.pdfIn PDF document text
    • http://tekirivira.iblogger.org/airplay_android_freebox_revolution.pdfIn PDF document text
    • http://sokfresh.fun/46556521954i3qhg.pdfIn PDF document text
    • http://elerctum.org/bessie_head_the_collector_of_treasures_text4d7cv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446015/normal_5ffe589b231bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383704/normal_5fe09f37a0b74.pdfIn PDF document text
    • http://site-shop.xyz/counting_to_10_worksheets_for_grade_19vh4g.pdfIn PDF document text
    • http://youla-24.cc/nacto_urban_bike_design_guiders58b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401519/normal_5fd93b7da29a9.pdfIn PDF document text
    • http://mmmuuuue.space/free_arkansas_learners_permit_practice_testkxzuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481821/normal_60183b60a514b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zefinut.rf.gd/kendo_grid_template.pdfIn PDF document text
    • http://jasigobup.epizy.com/adirondack_chair_plans_templates_free.pdfIn PDF document text
    • http://xuvufajozurez.rf.gd/zipiva.pdfIn PDF document text
    • http://kuwubuvorij.rf.gd/letter_writing_worksheets_for_grade_10.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_off0000e66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66F 5196 bytes
SHA-256: 948ef1322c45e94f4ce492c799a744c645e7e227b417b281974f8eb7ea3803e0
font_01_sfnt_off0000f81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 10884 bytes
SHA-256: b1b654a92047961b8cb3200804a54a78e5bd7582b286a2663b6f3b69a5b27f51

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