Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f52f0d0ba9c0fb9…

MALICIOUS

PDF

87.2 KB Created: 2021-09-10 12:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f9bc2805920d05461a75832c5ca75c3 SHA-1: b48c41cab50830ca14475c7ed33ee00d5e870de0 SHA-256: 8f52f0d0ba9c0fb9119524b76e54ab3326ed14e7ad8b77acb46a82268dcb5eaa
154 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, a 'download button' lure, and a link farm heuristic suggests a phishing or malware distribution attempt. Although no scripts were extracted, the PDF structure and embedded links are indicative of a phishing campaign aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613661eb8dcc5---bozofukivakivikuso.pdf In PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/gifalisasisegoboxegipix.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/fubewenisigut.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/lilopetakerinukakabujixuw.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/29803954049.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/vosazuradebefitag.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/32237401362.pdfIn PDF document text
    • http://www.siposferenc.hu/html/49226586453.pdfIn PDF document text
    • http://olympusflights.com/files/files/lafevidiketunuwoj.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/42873469369.pdfIn PDF document text
    • http://glassick.com/userfiles/file/89616318458.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/43489298369.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/xaxuzur.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/fifusodugatipemelazotel.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/resala.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/95306947138.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/51955938016.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/2385bf1b3224204417033905e519867f/kofugonozizoxal.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/sulabavivazivepixotiluke.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/jufotagulojirili.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/rikivaxeteje.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/73018834259.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/51337797833.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/wewifipedufidu.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/81514440942.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/46988735289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+root+your+phone+2020PDF 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_off0000f278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 17280 bytes
SHA-256: b0ce9dcf6ed0ec3cd9393b911a6ee753e3ca9b9fd3fe61d80eb0502a1b61b2e1
font_01_sfnt_off00011f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001375f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375F 10412 bytes
SHA-256: 563f9b5b151366d88557369e19ab9ddfa6588058c03cfc4bf5f89679f57d1d70

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