Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec80cea616a525c…

MALICIOUS

PDF

95.8 KB Created: 2021-09-23 19:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1bb3dfeeb664fee697f9a5fbe245ac6b SHA-1: aafe3204df601dda7294d459e4ac5cdc29fc025f SHA-256: cec80cea616a525c47b3567c716395fbfd7977b26bab40dd90f63e9a3fd81a6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are likely part of a link farm designed to obscure the true destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://boonfagrandhome.com/user_img/files/97861007348.pdf In PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/589b87af417ecf5f35ff1851f0da3a78/58592532689.pdfIn PDF document text
    • http://anm-av.de/uploads/files/78647985798.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/23296556343.pdfIn PDF document text
    • http://orem.mn/uploads/files/69364856012.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/zogizemut.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xomawaxu.pdfIn PDF document text
    • http://creationart.hu/files/file/lojifajejinelofuz.pdfIn PDF document text
    • https://nyig.com/files/file/62385694053.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/79081570080.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/97117415318.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/luwepijuriwotevutexud.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210907_1311CC4358F1254C.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/mojajarafukuruxiroru.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/sebevuwuwudidejoloko.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/15422190694.pdfIn PDF document text
    • http://wmsone.com/eimages/file/99340209471.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1947c0dda---87902621465.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210908_043027.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/fabamupozezutesevozafepaf.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/87459849395.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/sobason.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/vewuvuxifubunobemot.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/97581693241.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/xevuzukewefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cruella+streaming+engPDF 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_off00011036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001284d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284D 10464 bytes
SHA-256: 03fe21a04f338cca98e1ee035cad53f4c1e79d5a2d9c483889d84c86072041f9
font_02_sfnt_off00014007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14007 18996 bytes
SHA-256: 0d860b5f2d6fa644c598170944b9e427e5adcca45992fe5728134725bd13b5fc

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