Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa987dc6daadbf6…

MALICIOUS

PDF

74.0 KB Created: 2021-02-23 07:14:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2f3cfeef8f54cf1f6e800468b71eb09e SHA-1: 24d8b7b995fb5b5f1f7d25368d9d7f47508ec255 SHA-256: efa987dc6daadbf6cafbd9bfbea1663bfd52c4c1b2858e31f0d342cfab73d7ec
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external URIs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the document's structure point towards a phishing lure, likely attempting to trick users into visiting a malicious site by impersonating search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=what+does+roomba+charging+error+1+mean PDF link annotation
    • https://cdn.sqhk.co/leruwexikud/hal6FPh/police_officer_costume_plus_size.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486042/normal_5fe4f4760b96c.pdfIn PDF document text
    • https://cdn.sqhk.co/segisaxa/nnjgghV/valopawagokiwugi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459165/normal_5ff81bf52997c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_6022bc2217d3c.pdfIn PDF document text
    • http://papotanepif.22web.org/blocs_income_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401546/normal_601eae390d163.pdfIn PDF document text
    • https://cdn.sqhk.co/denobafopum/bRW9he6/jalonakiwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530429/normal_5fd0dc0802849.pdfIn PDF document text
    • https://cdn.sqhk.co/fofesali/Bihibhb/halloween_events_today_near_me.pdfIn PDF document text
    • http://lisulav.iblogger.org/rifokula.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pafexegud/fuvowuziketa.pdfIn PDF document text
    • http://legosipado.rf.gd/48687478818.pdfIn PDF document text
    • http://fizuxobitunoge.epizy.com/clasificacion_de_canales_ionicos.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/chennai_express_movie_in_tamil_isaimini.pdfIn PDF document text
    • http://femomebokubogom.epizy.com/axcrypt_1._x.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78A 5316 bytes
SHA-256: b4533aa69347ba2d8bd1c994def0502bb5e9d27d907fb0a8572b45cf53a1a2c1
font_01_sfnt_off0000e983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 10344 bytes
SHA-256: 5585d0d09d9cb55ad440f98052d4f0be3bc8f13f84c6ed559c061d418ace39cd
font_02_sfnt_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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