Malicious PDF — malware analysis report

Static analysis result for SHA-256 947b02b0d0f9a305…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 04:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c3766fdee8d9e48d0f8303dc1069748 SHA-1: bd92b2010def8539d2a1a5dedfacbebeeca35a3c SHA-256: 947b02b0d0f9a305947bd1e0cde7de0d6c2e02fe9731699220c8e84ebbb5f4bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers flagged this PDF as malicious, with the ML classifier outputting a high probability of maliciousness. The presence of embedded URLs and the heuristic identifying it as a link farm suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://gostinica-domodedovo.ru/files/7856015264.pdf In PDF document text
    • http://flyingfish-stay.com/userfiles/file/83801721277.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/nuwipumumujetigekegu.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/votiwifegefeweriwedo.pdfIn PDF document text
    • https://computerzone.pk/file/37003706505.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/voxekudibedotuzebukum.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/86634033965.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/24054875609.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/zujowewiko.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/13348375071.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/jugopivizovibarog.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/bd0b8eb77638fdf47225a11bd05166bb/dovadiji.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/45119720009.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/melojudupove.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/nudatala.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/9fe2b8ebd298602aa208b6184c3c4b9d/ripedekotizu.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/65509903419.pdfIn PDF document text
    • http://gro-felix.si/uploads/21313891053.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/guzes.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/12664762185.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/30405447441.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/68243460146.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/zanoronupuwuvamerer.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/47911311002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=paul+gallen+fight+updatePDF 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_off0000e5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B4 19420 bytes
SHA-256: b8044c0963798963d55d2589ad8c99b735e4103b72f56f7fca6698c68cfb4d5b
font_01_sfnt_off000117f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 10488 bytes
SHA-256: 2a1803efdd5c8bddabd37f2d7a5b6628d14a6244df1597fbb16909f5fe911fbc
font_02_sfnt_off00012f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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