Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb7f781e0672e2b…

MALICIOUS

PDF

86.9 KB Created: 2021-09-14 08:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 80c2c09267262598545819679e62f22e SHA-1: f4d070bf2798993702cd31d1cf2c1e30fa30853b SHA-256: 0fb7f781e0672e2b245eef0be4c4338cd3c8668e49946d85f95b7b71d9b693e0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many pointing to disposable hosting, consistent with a link farm used for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying a high number of distinct hosts and a link farm structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://studiogaleazzo.eu/userfiles/files/gatofigosatopalisud.pdf In PDF document text
    • http://bindashnews.com/userfiles/file/34466056670.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/6352072018.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/buxepatad.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/6276739375.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/nozajawozorokazalojilumam.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210913131529.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/vedidizejirafadelowusi.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/doxukotanijosajibi.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/tuwusarojalefusi.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/42880329780.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/11453574407.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/fejulevevepuxikip.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/17402252654.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51021536148.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/89080925891.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/64568143486.pdfIn PDF document text
    • https://e-midas.ro/files/file/dewejubojedurufajafegoj.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/33721474468.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/82161530784.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/62759932894.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/kaduwagivoteme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=world+war+heroes+ww2+modPDF 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_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 10420 bytes
SHA-256: 84f03936589a688c61f84f13604594ff21b28a07d8e85f939e0aa6902ed4f959
font_02_sfnt_off00011fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB6 18260 bytes
SHA-256: f70b780e174d891152480899a630be1249b90ef1ed4b55251666aebc991805b5

Open this report in the interactive analyzer, or submit your own file for analysis.