Malicious PDF — malware analysis report

Static analysis result for SHA-256 caffd75e804f44cd…

MALICIOUS

PDF

83.4 KB Created: 2021-09-21 19:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d106dfaef29d906f5835ab1a5962900e SHA-1: 09035f33d45f485c4f3e99620d5771568fa7fff4 SHA-256: caffd75e804f44cd6ef5fdf157319ed59deb58680cd998a14ee3ccca98bd7cf6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains a large number of links pointing to disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=miui+11+pocophone+f1+download PDF link annotation
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/17602780922.pdfIn PDF document text
    • http://urbariatprasice.sk/upload/file/vodaxudefanose.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/13685111460.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/8278633895.pdfIn PDF document text
    • https://thepainter.asia/upload/files/11041008450.pdfIn PDF document text
    • http://fohow77.ru/upload/file/58068376289.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/jadomuzajanoz.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/sibufonajud.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/2322867588.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/15732992253.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/jurazemokiruzowu.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/vesem.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/damuwilakevasetox.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/jasirezobifigox.pdfIn PDF document text
    • http://centronegozi.com/public/zijanexomadewasilebejini.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/geziwodujupolusirekodine.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/mugit.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/kubepiruvifedi.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/mesazono.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/27334759159.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/doverixapavufu.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/81943909862.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_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 18124 bytes
SHA-256: ce4d88c99d0641b1bf881056fad38ef22efafa40cde702bbb6d91bd58f8c08f6
font_02_sfnt_off000127fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FD 10580 bytes
SHA-256: d37923ae35a06f023fd31602048cb492f3e9d63f697718e50fe924f78835c6ee

Open this report in the interactive analyzer, or submit your own file for analysis.