Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ae20720dddfbcd…

MALICIOUS

PDF

85.9 KB Created: 2021-09-18 14:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 42424152217ae403c575359aa004b47a SHA-1: ff6ba9b2ffc89d2ec459f486b486e532a8abfebc SHA-256: d1ae20720dddfbcd8fb33258a0c8bfb4c7d493eda9368a02a25bcd882ff316a8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded JavaScript stream and the presence of numerous external URIs, including a link farm heuristic, suggest an attempt to redirect users to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://belovosushi.ru/files/renafajanewaxujojimeni.pdf In PDF document text
    • http://bellina.pl/userfiles/file/43843823691.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/20370835082.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/21747012819.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613177a8514ae---21787405580.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/71982695744.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/98371618883.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/78393935626.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/ketulu.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38440919796.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131467cb7da3---50036542175.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/fuzurelanoram.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/tefaxurobo.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-14/20210914044940875175.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/lazevuzoguvom.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/74626492926.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/65232509782.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/91083461820.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/siwarilazufelidurexazite.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/kagixalov.pdfIn PDF document text
    • http://aven.su/userfiles/file/3255520867.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210918174913.pdfIn PDF document text
    • https://blokhol.com/upload/files/wanosolevumudazipitabobaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=psn+generator+no+surveyPDF 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_off0000ea7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 10428 bytes
SHA-256: 75f4d009f24a930b834f2152290c410e75965c98c093129c4c0f0b8d025b235e
font_01_sfnt_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6E 18376 bytes
SHA-256: 87d9a02988e6978f85dbc0457a73d946fd928b54756427dfe471ec3a2d19dfe6

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