Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d25eea7975f129…

MALICIOUS

PDF

67.9 KB Created: 2021-10-01 10:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd8d17b365c46a0eb77d308316a9afc0 SHA-1: 1dcb858954ee45f07c85b284be81e647bdeab2cc SHA-256: 05d25eea7975f12994849d4f51d0a95dff2516e7145b9bf11aeb756d863e29d5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It employs a common phishing lure technique, presenting itself as an image to entice clicks on embedded links. The presence of embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, suggests it is designed to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://qianlong99.org/ckfinder/userfiles/files/gujizubikazos.pdf In PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3ec63fdb2---zudopezepijotuvegufame.pdfIn PDF document text
    • https://fivetc.net/uploads/files/newuwikeleserezuzexux.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/45333074584.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/mumulexewawufax.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/pifigerapabeviwaj.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd36df283---67691366874.pdfIn PDF document text
    • http://one9five.com/userfiles/files/vabejemonif.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/bifajalura.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/32298033950.pdfIn PDF document text
    • http://abnicum.com/files/file/fiten.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14243698945.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/66708176923.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/zugibirufoxujud.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/96329357869.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/56928755241.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/12022282509.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/debumobomunipaxazule.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/rejimilamo.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/lisudiwixinemok.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/lepamavidujomemiridurawaj.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/74841338385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+emojis+look+on+different+phonesPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/birodajumim.pdfIn PDF document text
    • 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_off0000adad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BF 14200 bytes
SHA-256: c895059d2db2bb44c3d1c173a4bd54ca2555c28d31ab3b134d7735814bc80bcc
font_02_sfnt_off0000e91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91D 10900 bytes
SHA-256: 49eb85bf856169670d167fa992712e2101b3d3d08d835cd3b99e1d4b09889f5b