Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc07e22caad0812c…

MALICIOUS

PDF

173.5 KB Created: 2021-02-14 02:33:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3c6c04bc57a7df8e11085bd9f57ad574 SHA-1: 66ec3ebc94df7cea9ce341a9b12ed74ec07547e3 SHA-256: dc07e22caad0812cbabf57c6f4c866f5b7ea9b2cd027f50357ca89cb0ee5f645
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically pointing to a domain associated with phishing lures ('druttle.ru'). The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links, likely for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites.

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
  • 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://druttle.ru/wix?keyword=aloha+elementary+school+uniforms PDF link annotation
    • https://puzuzabijil.weebly.com/uploads/1/3/2/8/132814257/nudagovew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_6012785dd9c3e.pdfIn PDF document text
    • http://sodahub.pro/command_line_interface_tutorial4anq3.pdfIn PDF document text
    • http://kabejorudedofom.22web.org/figopili.pdfIn PDF document text
    • https://tuzafezinaxav.weebly.com/uploads/1/3/4/3/134319976/wisumogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458389/normal_600f8275e162d.pdfIn PDF document text
    • https://dibasipelop.weebly.com/uploads/1/3/0/7/130738559/libodan.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/vekilazotibubawupak9u12l.pdfIn PDF document text
    • http://tomogorman.com/fujemivepuxilofopatas43d2.pdfIn PDF document text
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/3834670.pdfIn PDF document text
    • https://jijobowuzum.weebly.com/uploads/1/3/4/5/134590228/3384a.pdfIn PDF document text
    • http://instapodarok.site/jovorapilizawaxomupcugs6.pdfIn PDF document text
    • https://muwikilakejo.weebly.com/uploads/1/3/4/5/134519857/modozidifeboruk.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/mekonulegipero/royal_canin_medium_breed_puppy_feeding_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/ba_exam_date_sheet_2019_ignou.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/supplement_label_template_psd_free.pdfIn PDF document text
    • http://jubegovasoranaz.rf.gd/wumifigokamimezo.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_off000272be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x272BE 5212 bytes
SHA-256: 1bb4c63760744aab0eb03167cf7b29b153ed89ba070e912c119749ebd887f4a9
font_01_sfnt_off00028456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28456 10488 bytes
SHA-256: a9961cdeec689de70f0e9d4648603ce522817ac94eab67f7ff8e5aced8b97443

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