Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f760fd8e9a75a83…

MALICIOUS

PDF

62.4 KB Created: 2021-02-27 06:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c731697a619b2380e7923f4f13cfb5c8 SHA-1: 2ef950c55a460a840685be7384537639ad844115 SHA-256: 0f760fd8e9a75a83bfa8c04fd7ff480944143fd25bf1448c22d0ab46a0653d6c
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, appears to be a lure related to 'Hoover carpet cleaner parts store', suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=hoover+carpet+cleaner+parts+store In PDF document text
    • http://visekuturit.iblogger.org/canon_mf4820d_printer_driver_64_bit.pdfIn PDF document text
    • http://tuwuneluzuso.22web.org/sasevudun.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/woxotumomujajinegoladu.pdfIn PDF document text
    • http://juvugewit.iblogger.org/converse_all_star_plataforma_plateadas.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/g6GTjhv/john_gba_cheats_pokemon_fire_red.pdfIn PDF document text
    • https://cdn.sqhk.co/dakubakasilu/gh6kifa/47418013218.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xikusaduxofi.atwebpages.com/mosalusafuzagolodidu.pdfIn PDF document text
    • http://fafinonez.rf.gd/judakekujifodige.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/cessna_340a_performance_specifications.pdfIn PDF document text
    • http://dunixojojulif.epizy.com/pozoxareluguzib.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/fevobirolepo.pdfIn PDF document text
    • http://sujosivetobifir.epizy.com/36415113610.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/gupunul.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_off0000bc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4D 4948 bytes
SHA-256: f3e2a670d4359c40f139b734acc69b4bdb70b93d243ed8cee8b7078c77da38b0
font_01_sfnt_off0000cd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD33 9276 bytes
SHA-256: 97c8666a6bdcbd487b94263c22f3258dd060bf306308dd16583e181368886fb9

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