Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7986b78bdaf8610…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 16:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 43935ffe25e289db88c37ff0162b22d7 SHA-1: 9a2449e5c965129bec8eaf474d9c86fc0da9d1e4 SHA-256: c7986b78bdaf861009b87002304def0099fc905ce1a70335603f680184de9858
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of external URIs pointing to disposable hosting, characteristic of a link farm designed to distribute malicious content or phish for credentials. No scripts were extracted, but the PDF structure and embedded URIs strongly suggest a malicious intent to redirect users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=apm+starcraft+2+pro PDF link annotation
    • http://apple888.vn/luutru/files/16937669063.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/43175971825.pdfIn PDF document text
    • http://st03.it/userfiles/files/sulugajafakupariv.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/6365897378.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/2824970715.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/lubetegirepu.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/sekujuruwoseza.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/88184880739.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/kadixajujupaxeduvojol.pdfIn PDF document text
    • http://p-energo.ru/content/file/sipiritivimizopa.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/gefazepa.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/31386885492.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/55198056256.pdfIn PDF document text
    • http://yuli-china.ru/d/files/pasaxawaletot.pdfIn PDF document text
    • https://successalpha.team/upload/files/19271523936.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/87319467215.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210919174819.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/76101955357.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/fec8161662cade03217a72da115e3724/77129335326.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/bodipidanemi.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_off0000af1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC733 10368 bytes
SHA-256: 210a9fd81c94e91c8eab607de775abc263c06571902b012bf25ba8993d3ecf64
font_02_sfnt_off0000dec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC9 17300 bytes
SHA-256: 9ba2cd1fecdf50525f12edc94bd06e335282069483eb5bc145979f93bcc233dd

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