Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f74903cc48a931…

MALICIOUS

PDF

68.9 KB Created: 2021-09-18 15:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0adaf20d4e2109312f145d6d371cb162 SHA-1: bad63aa6658475c95f0dd3f4645b272b78089113 SHA-256: 80f74903cc48a93129e017b0a7309ef7928654ece0ec9b60dbeee7aadd292792
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The document body is heavily obfuscated, but the presence of numerous external URIs, many pointing to disposable domains, suggests an attempt to lead users to malicious content or phishing pages. The heuristic 'PDF_IMAGE_LURE' further indicates a deceptive presentation designed to trick users into interacting with the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 1 text block(s), carries a click-outward action, and is only 68 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://jsushibrea.com/uploads/files/54006295586.pdf In PDF document text
    • http://hasdeu.md/data/userfiles/files/56998358366.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/zufozosavodevasotiw.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/xibukuxumimimomulilu.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/tusuxel.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/82716211810.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/84309515555.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/ninogojazi.pdfIn PDF document text
    • http://labradory.pl/file/79046874724.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/32627180305.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/rerovupojipisumubijorari.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/6692841176.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///108291181.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/64309423133.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/12110056911.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/8303409532.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/lufid.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/9806f7b0ab9b033674d6f4edd0ccca87/zemabinapojopitup.pdfIn PDF document text
    • https://egf.tw/test2/images/file/77670352357.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/71966527664.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/56079494302.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/54244925827.pdfIn PDF document text
    • https://cncunse.com/d/files/zonogakisibalizuzavemaf.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/42814980869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+download+onlyfans+content+on+androidPDF 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_off0000b1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0C 14204 bytes
SHA-256: b8a6a66df05733472d88c4d545a8b6931d9a6328befc60021293ee9a089981fa
font_02_sfnt_off0000ed20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED20 10660 bytes
SHA-256: 74152141ee06d2600b134e8e9bb075d663f7c5610d6862c6eca4ac987517eea2