Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19be65760399e34…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 16:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9cbda4af3e93ace84ccaae29ffdcafab SHA-1: be52cb99ab695e1d8cc1ef638974788f77de7771 SHA-256: a19be65760399e34a93481b97f5b468c6c38626fbab57c0b4a9e1f83cc6a7ff9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs and is described as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=cast+a+good+day+to+die+hard PDF link annotation
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/pugaxitapasip.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/86563935802.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/paxebofepupanabejovi.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/99385768585.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161470a973bc85---xazazaribalodel.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/68206758786.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/87712323823.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/binekomasifabegiwosep.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/2487228889.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/46816648258.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/sofafuxuda.pdfIn PDF document text
    • http://csc0871.com/userfiles/file/20210916182930_cc9h83.pdfIn PDF document text
    • http://cpviettin.com/upload/files/migiwufosunixovotaxota.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/verexop.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-19/images/files/zekodudaruvekeve.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/75665663812.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/51546807791.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/63222293722.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/45987879693.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/vefuxax.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/joronerezonekogiguxo.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/36947244651.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/75070689991.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 15204 bytes
SHA-256: 4144ca9e5b2fec245a2d0889290aacd8f4177e2ba78cd095d658fc5957c67f08
font_01_sfnt_off0000d7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 10524 bytes
SHA-256: 8f26c97302582bf7399eda4f65e9e937c1363cf7912c6d82754a9ceb0996cf0f