Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ffb90c27e292bbe…

MALICIOUS

PDF

89.7 KB Created: 2021-03-04 15:13:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40951e814c7c28ce38158f2c95aa8122 SHA-1: efb86afa78fe26a1ef5006f7ecb88cee0329db21 SHA-256: 6ffb90c27e292bbe121118e9f878f6bd84a9ed9e2e40bee91f2773462f47826e
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=singer+simple+sewing+machine+manual+3116
    • http://daludaja.getenjoyment.net/tekogowatutijize.pdf
    • https://static.s123-cdn-static.com/uploads/4380536/normal_5ff9ce9d70588.pdf
    • http://form-lnstagramcopyrightservices.com/ramosupanomaseza5e2o9.pdf
    • http://ubzvp.com/the_babylonian_talmud_exposednslqr.pdf
    • http://itash.space/43307467798gs7jh.pdf
    • https://static.s123-cdn-static.com/uploads/4464878/normal_5fc6da66cd0fc.pdf
    • http://faripofijukevom.mywebcommunity.org/94584255453.pdf
    • http://nesorus.mywebcommunity.org/16979139146.pdf
    • http://easylearning.space/when_does_dork_diaries_14_come_outxivn2.pdf
    • http://bcpzon4segurabetaviabcp.com/lubukikames58snh.pdf
    • https://cdn-cms.f-static.net/uploads/4501993/normal_5fdaec6aaac4e.pdf
    • http://salestore.pro/chimie_atomistique_coursfo228.pdf
    • http://bamefidev.mygamesonline.org/fifty_shades_of_grey_full_movie_dual_audio_download_free.pdf
    • https://cdn.sqhk.co/risejesob/jhau9v1/nuvapeboxu.pdf
    • https://static.s123-cdn-static.com/uploads/4412380/normal_5fcbab07a077f.pdf
    • http://copyright-central-media.com/5035593737e0zrj.pdf
    • https://cdn.sqhk.co/xexerekija/dySZjcZ/new_world_history_and_geography_quiz_35.pdf
    • https://cdn-cms.f-static.net/uploads/4368227/normal_603bb3c768dae.pdf
    • https://cdn-cms.f-static.net/uploads/4465548/normal_602b9b3247297.pdf
    • http://899themes-demo.ru/chopin_story_of_an_hour5frnt.pdf
    • http://fartook.online/mikixipozafolt2iz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://diwavubodinaroj.myartsonline.com/fofemagila.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f31.bin
af33c29eef6d6988ccf0ea94ffff81fb5dbb99583809c7761a896277b34ffc64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F31 5912 bytes
font_01_sfnt_off00013339.bin
4a34d02ffd448fa009d64a2c0d4433e77f4f07715779a47eb4cca709bfb28be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13339 11504 bytes

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