Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b091642fe457b42…

MALICIOUS

PDF

68.8 KB Created: 2021-03-13 20:23:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 318f43d6715e447c08fd5c0340e4067f SHA-1: cc0df5261a0d728007b3a717b0c74737a4cc1a91 SHA-256: 1b091642fe457b42e4d0dc7d38d375cdc6c5398fcdfb26dc6ee4e6aa136f25c7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the structure suggests it's designed to lure users into clicking links that could lead to malicious content or exploit kits.

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://resalured.ru/123?utm_term=jenner+illinois+civil+practice+guide PDF link annotation
    • https://koledino.weebly.com/uploads/1/3/4/3/134332835/zupasewazedova.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/BhdfBNS/baldi_s_basics_classic_mod_menu_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/c6IaLew/vinonesusiri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404299/normal_602090e9dee8d.pdfIn PDF document text
    • http://allieshouseofhope.com/arinc_429_data_bus_formatudumm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458840/normal_5fe2d6ec49378.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/zGgjjen/40684193149.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/ilidigu/please_save_girl_child_quotes.pdfIn PDF document text
    • http://icily.xyz/hypertension_guideline_thailand8unxi.pdfIn PDF document text
    • http://tonagruz.ru/83742196492i2pxr.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/ibjgKpH/borepora.pdfIn PDF document text
    • https://zeruwowigewal.weebly.com/uploads/1/3/0/8/130813736/5030974.pdfIn PDF document text
    • https://tadilagene.weebly.com/uploads/1/3/1/3/131381422/1f098c9cf0.pdfIn PDF document text
    • http://libralab.digital/703625163428be5r.pdfIn PDF document text
    • https://cdn.sqhk.co/rebamomidaw/ijgcjhe/22190624817.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mevonaku.rf.gd/netgear_wgr614v7_as_repeater.pdfIn PDF document text
    • http://luzafofefo.rf.gd/52252059566.pdfIn PDF document text
    • http://zakuvusebaj.epizy.com/beverage_industry_project_report.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_off0000d05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05B 5288 bytes
SHA-256: 67ef02586ff5bf818bd7cb3af6419f8d0202f96e58ab4c86c7361a522f3e3f2a
font_01_sfnt_off0000e26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 10512 bytes
SHA-256: 6947b4d102c6ed7eb29982fb21d802fe77768474c8927213193ee5bfd92ad8c1

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