Malicious PDF — malware analysis report

Static analysis result for SHA-256 e965c5ece31d4fc7…

MALICIOUS

PDF

86.2 KB Created: 2021-09-20 07:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5e0e0ff93b854661ee5813b6b19a23f1 SHA-1: 8b9153b9a6638708b631c050302528579412c979 SHA-256: e965c5ece31d4fc7049bc8698f876c526bd88211227182a0b7200e65a44880fc
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 trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=pokemon+moon+3ds+rom+free+download PDF link annotation
    • http://haenuri.net/ckupload/files/45161067830.pdfIn PDF document text
    • http://gro-felix.si/uploads/nasurunir.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/dopavofovitufodewirajuwuf.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-17/20210917114758114997.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/gewodukelategupifefenuw.pdfIn PDF document text
    • https://tonitomov.com/picture/file/wovinatinuselekino.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/foduzisi.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/92604804078.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/53195732266.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/96911866906.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/lodisabuxenovagisax.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/730892603.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/4520480407.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/66205065751.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/58181373913.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/54673814323.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/99973994826.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/monoluwesu.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/dukuvoleturerozojajemiv.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/33596547019.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/tetanax.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/sogubavevetuni.pdfIn PDF document text
    • http://sro52.ru/uploads/files/90304751381.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/misewisuxumatoxek.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_off0000ea1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001022e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 19020 bytes
SHA-256: e8ed858c8f0401cab41ea411e08d96a86f9a1a1a0400cb3bb5d2a16e32542c8f
font_02_sfnt_off000132bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BC 10676 bytes
SHA-256: 257ac9254e33d8d3c16ac3bdd6ce2debed43ebe34b6d65a5e5e3a1ec4a09af8e

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