Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9d5bd8419284af…

MALICIOUS

PDF

75.8 KB Created: 2021-02-17 11:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b2bd7f304022be164cde4edac4409ac9 SHA-1: 0b6d477c13dc148f9d946c5a4ec0a88b996cb506 SHA-256: df9d5bd8419284af549319b4e1e74212baf0f19442b1b19bce63b974914902ca
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

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://jottigo.ru/wix?keyword=direct+variation+worksheet+kuta+software PDF link annotation
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/tapododonijuxolija.pdfIn PDF document text
    • http://samelike.site/76050298518o284h.pdfIn PDF document text
    • http://haifaiv.ru/electrical_wiring_residential_8th_editionxuyl0.pdfIn PDF document text
    • http://m-ryanaf.site/fallout_1_gameplay_guideyeelb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464055/normal_602beffed0d49.pdfIn PDF document text
    • https://dafufiwe.weebly.com/uploads/1/3/4/3/134368649/luwelisakekaradofa.pdfIn PDF document text
    • http://stassikorskyi.com/disadvantages_of_information_technology_essaycre7e.pdfIn PDF document text
    • http://kukikifo.iblogger.org/sagikenojakufupapiwexex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419851/normal_5fe6d37860005.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
    • https://s3.amazonaws.com/regufojalojaza/blogging_for_beginners.pdfIn PDF document text
    • http://gogewarixisude.epizy.com/bosch_security_rps_software.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/facebook_analytics_tutorial.pdfIn PDF document text
    • http://wipidomi.rf.gd/duwetugi.pdfIn PDF document text
    • http://wemosoxa.rf.gd/pepigi.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/band_of_brothers_theme_music.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 5036 bytes
SHA-256: 5ec30933c3076ed4c3408162acd3de5f0093aa86d97e13af7b087db13ccb93a3
font_01_sfnt_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 9688 bytes
SHA-256: fc80f77e9d938ff32b61151e7d88f3310f592a6c220f2bfb8ed86aebf039f078
font_02_sfnt_off000113f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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