Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5caaef380f27c7…

MALICIOUS

PDF

74.9 KB Created: 2021-09-17 09:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a73cc7a9c4a7ab0a1a6a89f885bb74bf SHA-1: d8b336d2441f39b177d99719aad4b2c9b4a03d31 SHA-256: aa5caaef380f27c7346886c79dc7f6a7f882262a9911ea5b2743c279884d791c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://adirondackseafood.com/ckfinder/userfiles/files/fogaginomuvaxexifego.pdf In PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/31162344187.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/33692318866.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37027247931.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/47769288122.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/zovoxojemodewizesiliziva.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/32412752533.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/7335161312.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/jopelofimuzurunog.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/jobezirabeviduvewijaxu.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/rumevupo.pdfIn PDF document text
    • http://ubest.ru/images/file/35019267879.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/nemojetumopopemobatif.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/20497223854.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/36318115652.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/janubigujalusoku.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d0a58abc9---dewemewitizasovije.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/73434160687.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/sedivake.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f0baea32fd4f4859a25b28470ddb7e03/12239606474.pdfIn PDF document text
    • http://ekosertifikat.uznature.uz/userfiles/file/fafobarikekajutisujas.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/99403832171.pdfIn PDF document text
    • http://ladna.pl/user_images/file/72501659822.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/89431185007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pvz+3+mod+apkPDF 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_off0000c194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC194 10204 bytes
SHA-256: b40df9eac4973c35a6c14862e5a71a4f39f77bda249f49e6056e09a3f2c4d9ba
font_01_sfnt_off0000d87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87F 17584 bytes
SHA-256: d33b28aaccbd53dbadfc3a179e3c7e2d99d88c24480d1f956023ae8974c56c4a
font_02_sfnt_off000105d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1