Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba305804b5084533…

MALICIOUS

PDF

67.8 KB Created: 2021-09-24 17:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2ef79b71319e47c441568b38a56ed2f5 SHA-1: 88c40e81dffe9f58e3f9806449f49ae91cc0a327 SHA-256: ba305804b5084533c288f4c8d1a0c1603aeca67df11c0b0635b4b44667a091e3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure with an image-based screenshot and a clickable action. It contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm designed to obscure the ultimate destination or distribute further malicious content. The primary attack pattern involves tricking the user into clicking a link within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pietroquatriniarchitetto.eu/userfiles/files/tubepe.pdf In PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/tiror.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/sosarirezipux.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/59841570115.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/mipufaxezozimefub.pdfIn PDF document text
    • https://intersat.lv/files/file/95252189329.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/36841848767.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/lakamudipitapagikijesevu.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-2/20210902150854223708.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/renoxukuwizapono.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76158748198.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/tudewogulexalij.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52164606411.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/xebebazitam.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/sorizine.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139711920de5---32987334070.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/gedaxagipuxesimifikegito.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/texekusiviporenosow.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/f222d1d0509ab66e5b4c4d6364f66f1f/taxaviwerupisaranijes.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/6188462251.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/zidutotupi.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/31493604664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=app+for+watching+free+web+seriesPDF 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_off0000ad1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1C 10920 bytes
SHA-256: f917bc3a2833cc88489c4b8432b8267ac8151c3ed4ef94ae3cbbd799b08a7545
font_01_sfnt_off0000c647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC647 14368 bytes
SHA-256: f1adf0ee95bff31cf18ec9d99187660f130c84604690cd07fc593f36482f8ea1
font_02_sfnt_off0000e9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1