Malicious PDF — malware analysis report

Static analysis result for SHA-256 869f81d86fa29c49…

MALICIOUS

PDF

94.6 KB Created: 2021-10-24 16:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ea6b851abcb0f8e337d88ae660119503 SHA-1: 8f1175b62b1b73250d0010c292a7fae7b0d3f51e SHA-256: 869f81d86fa29c495f2ad6b3368724c44994a84e0b7e0e4e061508eaca2a3b7f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of distinct hosts, suggesting a coordinated effort to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pomtco.com/technical/files/file/jigidavitaruvek.pdf In PDF document text
    • https://digireg.nz/upload/kaleniligudilavufope.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/bupaditeluzadotedopozumu.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/46269312027.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/37645313847.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/xogopawide.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/52968378607.pdfIn PDF document text
    • https://posh.hr/files/98768537128.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/57283241928.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/46162980205.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/35360951892.pdfIn PDF document text
    • https://www.poeles-granules-vasconha.fr/ckfinder/userfiles/files/5161580829.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/12870672453.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/75289634824.pdfIn PDF document text
    • http://parateam.cz/file/takafubirifipolax.pdfIn PDF document text
    • http://shamayachts.com/upload/file/46056531312.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/88267918061.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/66635827807.pdfIn PDF document text
    • https://angkagenap.com/contents/files/tifufaruvoxewuwakese.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/manopenufov.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/74832761954.pdfIn PDF document text
    • http://sdes.in/uploads/94201746807.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/kugumadufazosenux.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/12311100258.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/posewazulax.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/1hHberoKktI/uplcv?utm_term=dialog+expressing+intentionPDF 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_off00010d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 18192 bytes
SHA-256: 5826685caf36ea187babf81bd7602f23e871de2cf900f48ffbd407e281b8f491
font_01_sfnt_off00013c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15439 10528 bytes
SHA-256: df982d17d30effabaa4a014bf0d9678ad63c4a9ebf969b79b222363ee3e258b2