Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec454951588b3875…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 18:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 77b7547a0228600e503dcd86772b1fa8 SHA-1: 49a125d8950a8cd2127721177800ecc2789d8e49 SHA-256: ec454951588b3875ec3569c9e6a0abe9d7bae8c4331ee72aa454b9928ebfe895
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs, suggesting it functions as a link farm to distribute malicious files, with one URL specifically mentioning 'download messenger'. Embedded JavaScript streams are also present, which could be used to facilitate the download or execution of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=download+messenger+2020+apk PDF link annotation
    • http://clair-environnement.eu/catalogue_dynamique/file/544107958.pdfIn PDF document text
    • http://agavietnam.com/img/files/mijemofelodenavoravemiso.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/jufedujujikigitijado.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210914135448.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-03/images/files/pisopudafapoborodewutile.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/xiwotibiguworugizoxu.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/46939835147.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/2385220743.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/52917306002.pdfIn PDF document text
    • http://alltechsro.cz/files/60543059279.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/wojufuzeteg.pdfIn PDF document text
    • http://www.pilartangguh.com/file/zuzivibifefuxonosawetulo.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/pubeliruxowimozugakolal.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/41730012011.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/af8f4071fd899c3809cf6eff809f2983/82067861256.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/81798532989.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/bujibam.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/42723716023.pdfIn PDF document text
    • https://rubfila.in/files/file/satoxubas.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210920085929.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/werubodiwugukipapuzo.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/xitiwalifa.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_off0000d8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B3 10968 bytes
SHA-256: e183dd81e1bd0af901f84572ba2fc9b7a8417ab946c23d4ef6836c289d3ae332
font_01_sfnt_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 18060 bytes
SHA-256: ddb1de1c4cecb35fd75cc46f92f1e5cfaebac8e687f43ee39644932239938e19
font_02_sfnt_off0001209d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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