Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b43b2a237543be0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 10:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: abe1f79f6bfac6989c97365bc0048f60 SHA-1: 30a8f0c7ce3442f5ae60251dc97d3b542d74ceae SHA-256: 3b43b2a237543be0f92790d5469a8e3a5655d7e03657239b175389994b989776
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to potentially malicious domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it's designed to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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://ppogrimall.com/upload/editor_image/file/68451866845.pdf In PDF document text
    • https://keongracun.org/contents/files/67320894247.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/xuxebugadikajadim.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/xijozesadasifizavobux.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/lanurugilogixiwaf.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/93908782102.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/99915710022.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/sevavevix.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/bepulivolebewezudazam.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/vuzazakugudesilidiv.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/wiluwafotuxitawekituzu.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/xowug.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/91411350051.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/ridowemejagipafomofobelok.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/temowasevigurol.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/gisijutafemavi.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/dujabopesenesef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=apps+crashing+android+10PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70C 17760 bytes
SHA-256: d94791bdaf82d83b8d9d512d1d0b3eef14cf8be1a8fc906bec64759b72ab02f9
font_01_sfnt_off0001057c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 10672 bytes
SHA-256: 91e69a72fcc46c5c4bd4a1003ed744acbcda3e7eabd0a742d9c4e45ca44df05d
font_02_sfnt_off00011dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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