Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf00d5779770ea2…

MALICIOUS

PDF

81.8 KB Created: 2021-04-01 07:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ea025d8962539d6723b6ecc9e845e084 SHA-1: b903a124c6bbb99e8d89f570c7f70aff3b1b9698 SHA-256: 0bf00d5779770ea2e7194e5c91e0a020b7b930aab044825a01e483bef4ff6e15
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered as a spearphishing attachment, designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=is+dewalt+still+a+good+brand PDF link annotation
    • http://prizyivnik.ru/how_to_set_acurite_indoor_outdoor_thermometerjnhtn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473654/normal_60307a408954c.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/zenunarupulekazif.pdfIn PDF document text
    • http://hookup668.site/ancient_of_days_gospel_song0sn2r.pdfIn PDF document text
    • http://kvrovk.xyz/how_did_the_cold_war_affect_the_environmentmm7gs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411916/normal_60295b68c6107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_601f31198fecf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443362/normal_5fe4d3355e81e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370087/normal_5fd7cdb2bdc90.pdfIn PDF document text
    • http://kpovli.ru/7586346287675ofd.pdfIn PDF document text
    • http://stalekost.site/51480433445xkfht.pdfIn PDF document text
    • http://stakingyfi.com/dakaxovimasoluvujusidgwctr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489732/normal_60621d9cdc078.pdfIn PDF document text
    • https://cdn.sqhk.co/sogupavetut/jahggex/43660197327.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/how_to_start_an_essay_about_fooduxin4.pdfIn PDF document text
    • https://zapirugitoz.weebly.com/uploads/1/3/4/5/134508168/603375.pdfIn PDF document text
    • https://zujakeme.weebly.com/uploads/1/3/4/0/134041616/zitos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403946/normal_5ff1698927fe6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494866/normal_603b7ad0a7e86.pdfIn PDF document text
    • https://majabowuji.weebly.com/uploads/1/3/6/0/136092793/ririzemivugif-tulajitezed-galidogek-dutadera.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/5hjagfk/minimal_wordpress_themes_for_writers.pdfIn PDF document text
    • http://autobuff.xyz/twitter_free_for_windows_10aftnx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 5164 bytes
SHA-256: ba77fe1b3a725094ae66aa05cd8527535a567dc02a0cbb23de70f8b02134b02a
font_01_sfnt_off00011657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11657 10584 bytes
SHA-256: 630d4406a9cb18e3b9286db1118f268fa5888e3071191ee37e7698ad4ec59e88

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