Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ed85e12d370053…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 19:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 285fbd3e756588bfb3d709081d0dccf4 SHA-1: 1b61525645772d9e3a71c737148fe30ca01f7687 SHA-256: a1ed85e12d370053281e947ddcf268b2f9518387451da7b4eb01b3633e65d4e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or purpose of the links. No scripts were extracted, but the overall structure and URL distribution point to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://dryoucosmeceutical.com/userfiles/files/38685571713.pdf In PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/72666553662.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/funulalavimux.pdfIn PDF document text
    • http://hrudolf.com/userfiles/68803866307.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/rozezoxesebodanefuw.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/36670699801.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/worepe.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/82840915295.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/motovovofumonowimuteterud.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/najuzejolotiga.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/36252379545.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/sedozipifoged.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/37305983510.pdfIn PDF document text
    • http://jfe.hk/userfiles/92402870881.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/56179570461.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/nokasisepanuzuxumu.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/95183996835.pdfIn PDF document text
    • https://businesslife.com/content/files/zujanagirujedox.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/zajidaxenoxuv.pdfIn PDF document text
    • https://eventaipei.com/upload/files/23976722552.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/tukebevududatori.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/xuren.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/jadur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=after+full+movie+online+123moviesPDF 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_off0000d463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD463 17424 bytes
SHA-256: 1420aa06234ea4345adb70b85757bc7bf2d2e7c3702dcc4edb746004d272a256
font_01_sfnt_off00010113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10113 10704 bytes
SHA-256: 7b915d6f006bd8ada5730613ab3a27c708e70a430b0ffde8f6b694b507cfbe5c
font_02_sfnt_off000119d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1