Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed378c229778231e…

MALICIOUS

PDF

89.5 KB Created: 2021-09-10 03:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 251dd3478cf1f5e2df89c690934bf839 SHA-1: 4f1caead2e5d4f8c49071467085bbcc4a01e1678 SHA-256: ed378c229778231e274b52485799c3769c30ff3d9c94e4cb287080a4e27a5511
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external domains, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to potentially harmful content or facilitate SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://patp1ryb.ru/media/file/75878282907.pdf In PDF document text
    • http://raegcafe.com/uploads/files/35987879063.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ce4cc4ca22d0c1def18e1d74fb9b261a/54981080465.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/potosuxevukunipewesuxosot.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/20254484169.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/73958779994.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/52425198761.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109090816378512.pdfIn PDF document text
    • http://otczenacts.com/media/files/wexigelotet.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/bewazijuwokafugoz.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/41586514856.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/71156464900.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/mogewilu.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/bojiwizavijeb.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210903045016.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/keneli.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/samewegovosaxedulomujitod.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/sobisawegukudubumozu.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/4297203482.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/79044089712.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/galitegoketarufesasirotaf.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a071d968a01357dc2d496dd5d47dee86/70962180584.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/86149585608.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/xonawubezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=adblock+chrome+pc+downloadPDF 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_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 10720 bytes
SHA-256: f73ade89e766cd14146c5beb9b1835e5603065fd5906f40ad9a2151feb95c90b
font_02_sfnt_off000126a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A5 19172 bytes
SHA-256: 036f4cbb22f98cc87a5c6c2ff4011750417e19b8b1326589b42d5569cb42f159

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