Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40621332450416d…

MALICIOUS

PDF

89.3 KB Created: 2021-09-16 18:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 41e52d62b8479d0d474393e39adf466c SHA-1: 4abb39bedd5cb0fcaa52c8fa879a18ce73da0db4 SHA-256: d40621332450416da32f3bd22e3efaaa6e816337c0f394577031f7dfc16997e9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, with one pointing to a raw IP address, suggesting an attempt to redirect users to malicious content. The PDF's structure and the presence of embedded links are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://alacarte-grafik.de/userfiles/file/13795006610.pdf In PDF document text
    • http://mini-garden.ru/userfiles/file/57208140665.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/6690179974.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/53995870572.pdfIn PDF document text
    • https://kopari.hu/files/file/nugikujikixezigosotixuz.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/tumirixudexodusenolat.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/pijonuni.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///bebegirumiparabufuzixus.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/bojidoj.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/kukewupazetekonak.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210905061448.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/80220253841.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/24300111393.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210905053207.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/41665631455.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/45984048648.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/pokedowukufoxajokupovo.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/gapetapigevigisogesasi.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/mawewot.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/bojusokanivikavegufegon.pdfIn PDF document text
    • http://hainfelderteich.at/11723047607.pdfIn PDF document text
    • https://solturism.ro/images/file/59591944299.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/linipasum.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/71453341923.pdfPDF link annotation
    • https://blueparadise.pl/userfiles/file/kunajuxemibowesekukeridu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=can+siri+be+used+on+androidPDF link annotation
    • 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_off0000f73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4C 18584 bytes
SHA-256: a8747c014e2d6af075827b28456e9a52dcd5d82a353a04e1bce5acb2d194b671
font_02_sfnt_off00013fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC2 10368 bytes
SHA-256: c23abc1eb2b8c552eb4e329a2da2fa46f0d5c9c72d5bc574b5a4686fcd0810b4