Malicious PDF — malware analysis report

Static analysis result for SHA-256 d696c2a58efc8261…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 04:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3beb79ab84d106b6d08202d0efa37a3 SHA-1: 39d6a68587cb7f0cef7ff9d478f05c7e524a21e8 SHA-256: d696c2a58efc826193be21e0b812ef632264332746aff3b75e11148357755696
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only document designed as a lure, typical of phishing campaigns. It contains numerous external URIs hosted on disposable domains, suggesting a link farm intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://philabc.ru/uplcv?utm_term=flight+sim+2018+mod+apk PDF link annotation
    • http://phongkhamthienhoa.org/images/files/zorexazubeperarofi.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/bupupijufuriredejonibixam.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/10781894001.pdfIn PDF document text
    • http://stringladies.cz/userfiles/76397181739.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/kuvozelulemazisuborilip.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210906002012.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/puxopo.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/gedalewinegegivu.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/1445116913.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/bufulefa.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/7964115317.pdfIn PDF document text
    • https://atiksigorta.com/files/12739798584.pdfIn PDF document text
    • https://razredna-nastava.net/files/vizuvewosobetuneroxofaj.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/nizupupizazazekateraza.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/lasazojodavawaxamelafafu.pdfIn PDF document text
    • http://hotechike.com/files/files/kokoduzawok.pdfIn PDF document text
    • http://donghotam.com/luutru/files/239139329.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/68505190367.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/zuvuvoxesezesofupanaful.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/nafexuregi.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/76664993458.pdfIn PDF document text
    • http://skia22.ru/pic/file/degowewarok.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/zemagurekunu.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210905043521356403mponjb61h4oc.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://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_off0000b0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CD 14340 bytes
SHA-256: 56b2bab09feab7d9794b9fab9fc20387826b04931d7e03716db5d255e0336f8d
font_01_sfnt_off0000d4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 11072 bytes
SHA-256: 045b5b4fe128535760b6d7acd87a87b090a27fd528b763bad90a7c94624c7882

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