Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0400cb87754034…

MALICIOUS

PDF

81.4 KB Created: 2021-04-05 03:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 979d8b5082119e20b93506aa20083cd1 SHA-1: 7cc1720217c8bf3fffc10457cc6b91ad1e85a646 SHA-256: 4b0400cb877540344a44d5f1c9b81a5b7aef3fa6974a3572a79401ab57dc9d05
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URIs, many of which point to disposable hosting and utilize UTM parameters, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

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://bologen.ru/strik?utm_term=alesis+qs8.1+dimensions PDF link annotation
    • http://smartcoin.design/renault_megane_3_wiper_blade_sizeydod6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428342/normal_60032714ad22c.pdfIn PDF document text
    • http://politach.com/20829764361h3v2g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450504/normal_6046aef1d8dc5.pdfIn PDF document text
    • http://health-top.ru/pafusisabafurolulektatph.pdfIn PDF document text
    • http://c-advance.space/huffy_bike_walmart_cruiser762bt.pdfIn PDF document text
    • http://gufutaca5.xyz/u8_smartwatch_price_in_nigeriah085v.pdfIn PDF document text
    • http://mebelrostov.ru/les_nombres_jusqu__100979wh.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://instapodarok365.site/86744390619izc5d.pdfIn PDF document text
    • http://lnstagramverifycentre.com/nigavofisikodivonam384u2.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
    • http://bunopudo.rf.gd/90919905859.pdfIn PDF document text
    • https://e39bfc17-a898-4016-ac91-fc9303c112df.filesusr.com/ugd/b5068a_ddcf080b284e452ab0dc28531ba7bfaf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/56943249088.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/which_bible_is_closest_to_the_original_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/80990123934.pdfIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_3a03a38a53454011870521cc41adffa5.pdf?index=trueIn PDF document text
    • http://raxaxeve.rf.gd/ils_nous_informerons.pdfIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_9d8abb3b9d99463db51518873993b0f4.pdf?index=trueIn 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_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 4764 bytes
SHA-256: a3dcc52ecea1b303abe3bf71f198b6565eb91c877c488a676f4fa24710727ece
font_01_sfnt_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 11964 bytes
SHA-256: 17fcf01152b6d3dc440fb1a23e0363f6f4a1b3ab10bddcf60a6dac3b2ba1617f
font_02_sfnt_off00012a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A68 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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