Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45c40883d10356e…

MALICIOUS

PDF

73.7 KB Created: 2021-03-24 03:08:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a962f742b07ffe217472c5265d6c75de SHA-1: 9e6505d4c08251a09d100dc6d88d8d5edae8c6c9 SHA-256: e45c40883d10356e9f33584a2d13fa67a53093ac4784f3c4d09d2509998c419c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, 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 for phishing or distributing further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs points to an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/wix?keyword=5.70+x+8+tire+harbor+freight PDF link annotation
    • http://tactical-jacket-sale.shop/gulorujokow92hg.pdfIn PDF document text
    • http://oyuncuxx.com/holt_science_spectrum_physical_science_textbookmk7js.pdfIn PDF document text
    • https://latesadujogoxov.weebly.com/uploads/1/3/1/6/131607544/mobezerukekow_farekik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453902/normal_5feccbb0c5e06.pdfIn PDF document text
    • http://cashthe.ru/how_to_find_vif_in_pythonit50s.pdfIn PDF document text
    • https://judozonax.weebly.com/uploads/1/3/1/4/131454501/7126023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465006/normal_5fd7c99752dfa.pdfIn PDF document text
    • http://arendagg.xyz/zutopadii6d3b.pdfIn PDF document text
    • https://jivixetikuzi.weebly.com/uploads/1/3/4/7/134745571/kijuteresapafagof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451229/normal_5fceb52da8f81.pdfIn PDF document text
    • https://tomosuboma.weebly.com/uploads/1/3/5/3/135382902/6481682.pdfIn PDF document text
    • http://idealicaufficiale.website/35531648644c5zoq.pdfIn PDF document text
    • https://tixonanixob.weebly.com/uploads/1/3/4/8/134890866/rubokolenomelav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367635/normal_5fef3c638a7a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417656/normal_5fe66cbb75c2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485942/normal_602745ee6c664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404730/normal_600a66bf9ed19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jusuberu/tigoxeguzizinurudogi.pdfIn PDF document text
    • http://webifojut.epizy.com/98015784139.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/3338634400.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/jizuna.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/is_logitech_m325_compatible_with_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/2639995049.pdfIn PDF document text
    • http://dojopugoput.epizy.com/acknowledgment_sample_for_thesis.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_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 5504 bytes
SHA-256: f1106f6566260637da55b2fb44e3849c7b8ef42e51786f461a90dd180264663a
font_01_sfnt_off0000f266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 10876 bytes
SHA-256: be8881138224a14dd13953bfb45dd147ec9aa09853430a9324466adae4512a38

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