Malicious PDF — malware analysis report

Static analysis result for SHA-256 463b75d6b563dccb…

MALICIOUS

PDF

77.5 KB Created: 2021-03-02 21:15:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d1e071294ab0c0f1245a4e5ec788b4a5 SHA-1: d83b4b1183914213075272ec3bb1ce23390b0301 SHA-256: 463b75d6b563dccb63e3e80cf14bdd964070e2b064bd6a09e6092dae47d9cd18
126 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to 'Farberware coffee maker instructions' and the authoring application, indicating a lure to disguise the malicious intent.

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://gimoguvi.ru/strik?utm_term=farberware+coffee+maker+instructions PDF link annotation
    • http://whysmall.space/wallpaper_beautiful_nature_hd_photosg0agq.pdfIn PDF document text
    • http://mexicotop3.xyz/vejosomigolqqir.pdfIn PDF document text
    • https://lirukasuk.weebly.com/uploads/1/3/0/7/130739032/vefoxavoxalaxigakogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446765/normal_602bafa9291fd.pdfIn PDF document text
    • http://tublitalia.space/tumblr_wallpaper_pastel_quotesbu63p.pdfIn PDF document text
    • http://nigasheff.xyz/1315624829qd04c.pdfIn PDF document text
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/ced432.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fanutebuxus.rf.gd/programmable_logic_controllers_5th_edition_answer_key_chapter_1.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/local_tv_guide_melbourne.pdfIn PDF document text
    • http://ruvowepager.epizy.com/2768258353.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/grattan_institute_superannuation_report_2018.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB07 5244 bytes
SHA-256: 9752155626126898a159009c19893d2e94c60c8b79a8bb75a2b6fff9fe289500
font_01_sfnt_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 12168 bytes
SHA-256: 62bdefa512295e20d874562475478e5f38c6f60e51d652f0aac381d48465d5e1
font_02_sfnt_off000113ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EF 16192 bytes
SHA-256: cae38d9da3505f9ca430778d2af89aba0e188975e211645032e0167081cd4c47

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