Malicious PDF — malware analysis report

Static analysis result for SHA-256 592e2006d06dd1ee…

MALICIOUS

PDF

68.7 KB Created: 2021-09-24 18:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 83accc78a68615afea33b46cbb6d5dd0 SHA-1: 0973486dc52a27515d439794714a59dfb0ffdbc4 SHA-256: 592e2006d06dd1ee2a78fcdc8f6217563263bb60d0dad08ac891500199cee0a3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, containing numerous external links to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and numerous URLs suggest it's designed to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 0 text block(s), carries a click-outward action, and is only 68 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://infrive.ru/uplcv?utm_term=find+my+friends+app+iphone+android PDF link annotation
    • http://bjerkelunden.org/content/files/userfiles/file///11886329938.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/92848c9b407f117e1f0b19787c6023a4/92901622426.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/4466845393.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/fexipokozopofig.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/5982248309.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/48639249340.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/82011520758.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5pkrgoj30snrh6cncum2fejfc7/79206407514.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/85646353295.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/30996463958.pdfIn PDF document text
    • http://d-innovation.com/upload/files/kazoxifaxuxesade.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/40279591240.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/vunedetilivofatokopiweda.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/velaje.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219839544844.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/9779840924.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/54943222002.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/tareroxiz.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/zotuwavidejofuxuxas.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/33343675089.pdfIn PDF document text
    • https://ags-car.com/upload/files/90583486912.pdfIn PDF document text
    • http://haki.vn/uploads/files/62079631010.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/dulovufuzu.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_off0000b116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92D 10712 bytes
SHA-256: 2af3e06fb151a904bbfba88d5b8f68a1c50c53719cbe167613a6c014a41a48b9
font_02_sfnt_off0000e183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 14240 bytes
SHA-256: 29ec60d56614928165d98ac9eb1ae3df379d75f34e4919b44aa5423969cc72d9