Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d37e1d402c0f7b8…

MALICIOUS

PDF

79.8 KB Created: 2021-03-02 11:53:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c10f569fe82fe7d4f68c8742d37518f0 SHA-1: ab20a67e44bd7c01ad199305b1dbf56e970e1030 SHA-256: 1d37e1d402c0f7b8ce27cd970c3bfd51dab876957e11a487959231f691fed4b2
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically highlighted by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though partially corrupted, contains a lure related to urinary tract infection symptoms, suggesting a social engineering pretext to encourage users to click the malicious links.

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://baarspo.ru/strik?utm_term=que+sintomas+te+dan+cuando+tienes+infeccion+urinaria PDF link annotation
    • https://zuverikaniwofu.weebly.com/uploads/1/3/4/1/134108987/5904532.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370302/normal_5ff42c9f68dba.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/bepetilamavimofivoval4n18w.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/m5dhfKa/rapuxojonumedezukojiwota.pdfIn PDF document text
    • http://edayafar.xyz/rodopujefuxudikizineyf04q.pdfIn PDF document text
    • https://doritader.weebly.com/uploads/1/3/4/8/134885844/93097beb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443372/normal_6019c116cdf99.pdfIn PDF document text
    • http://1-bog.ru/786737047699dkm4.pdfIn PDF document text
    • https://cdn.sqhk.co/fufitefan/gfif2je/let_s_die_together_gif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489035/normal_5fe6688879c04.pdfIn PDF document text
    • https://bepogopinaw.weebly.com/uploads/1/3/4/7/134742936/robarasa.pdfIn PDF document text
    • https://lerugusenexeke.weebly.com/uploads/1/3/5/3/135317851/4f1838bb8f6.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/jovekus/nesokarabeponefodul.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/bumbling_crossword_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/attraction_movie_in_english.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_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 5196 bytes
SHA-256: 54efbbef2a6d4ec783d0e6f59b459aa5bb3b1a4c4fcaace431384f5011111d02
font_01_sfnt_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 12196 bytes
SHA-256: 2b1286008dca0e438dfd27cf1a5f183f3da30e15e2fee6ed729b1349f50249ea

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