Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac154c958651bfa4…

MALICIOUS

PDF

74.8 KB Created: 2021-09-13 14:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7912263025e32a3b3c32ac9b87089c91 SHA-1: 0802e71b4dffa2d612a93d128e86139a582e7438 SHA-256: ac154c958651bfa4f0890a54030a595c8797009295a967b93107ac718832da05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to link farms, suggesting an attempt to redirect users to malicious sites. The document's structure and the presence of many links indicate a deceptive lure, likely to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hometextiles-consultant.com/ckfinder/userfiles/files/54987173924.pdf In PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/46935272377.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/20531810721.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/80401522290.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/wifaxavuxu.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/37304923671.pdfIn PDF document text
    • https://scalping.ir/data/files/file/50854620606.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/59670108052.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/xufesogise.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/pukubomazugi.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/26208179371.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/25254031232.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/24447682783.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/62339708887.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/ketol.pdfIn PDF document text
    • http://chengzechem.com/upload/files/zovabuzi.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/miwibezop.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/fobutowamude.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/85696686100.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/wikutixenesiniliv.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/33707711374.pdfIn PDF document text
    • http://gibisch.org/files/files/58367477629.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/paganefapobal.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/kewedanomuse.pdfIn PDF document text
    • http://zuche0551.com/upload/file/41656295919.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/3278522940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=std+11+biology+textbook+pdf+in+gujaratiPDF 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_off0000b890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB890 11312 bytes
SHA-256: a577bd71b9de1bf63a4a916666c15ee38b32506e2333431eb507b9dcefb2eb66
font_01_sfnt_off0000d2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E2 18936 bytes
SHA-256: b9f7cc3ba6de2d75b1c1b1836935ad563d5fdd735293c79dba69bb568bf4ebec
font_02_sfnt_off000104c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1