Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde49db03bfefa38…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 06:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 740aae1cb179e1631c38a69c2523f3f2 SHA-1: 9765df185d04af090b57aa0f7e004e4e34ae11a4 SHA-256: fde49db03bfefa38b59929afbe2fa5423330af4c19768b918884f5fc4504bf1a
134 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to numerous external URLs, one of which is `https://allytemp.ru/uplcv?utm_term=how+can+i+update+my+phone+android+version`. This suggests the PDF is used to distribute malicious content or phish for information by redirecting users to potentially compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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 https://allytemp.ru/uplcv?utm_term=how+can+i+update+my+phone+android+version PDF link annotation
    • http://hevolta.com/upload/file/66091656616.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/32411237380.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/tezeroropuz.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/86363078935.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/43691590845.pdfIn PDF document text
    • http://sadrokartonyhk.cz/images/fckfiles/file/60308106533.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/19061188793.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109271754018932.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/97678187624.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/2230170456.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/9538686882.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/42372323972.pdfIn PDF document text
    • http://erpos.sk/data/files/bamesaditizit.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/jefejiw.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/51106323783.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/63799095335.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/nekogenejafetare.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e1c5d6fd6420613e2aaf0a2e3315d838/dejaduzubomeno.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/8420786492.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/tevifux.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/69588706055.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161335a195a43a---22303926264.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_off0000ad05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD05 11092 bytes
SHA-256: 0e5a5640c082d640ef86ee3000005ec7fac5bdd45b36d86db048c14bc4d58a2f
font_01_sfnt_off0000c6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 15040 bytes
SHA-256: 3487971364dcda35378898e07d658a25b8ac9f5746d5b47e51ee8078ed4d6131