Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4a23cd8303a61e…

MALICIOUS

PDF

72.3 KB Created: 2021-09-08 12:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 71223079726969163f04542a76bb67a7 SHA-1: cfa14edb582a8534b5c085b0b8af544d12860f6b SHA-256: 6d4a23cd8303a61ea705baa15abeaef161e771bd27a1a2230d9131fa4028fd6a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=hyperprolactinemia+and+infertility+pdf PDF link annotation
    • https://detectagsafety.com/ckfinder/userfiles/files/86350670887.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/15611001090.pdfIn PDF document text
    • https://csodamalom.hu/files/files/sagibugabupolawusidu.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/wipiborefexu.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/jeripesa.pdfIn PDF document text
    • https://camphacement.vn/upload/files/madobazor.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/kasaguduw.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/91736047974.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/37845171989.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/tozavas.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/64616579832.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/76588348858.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/81425061516.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/34864428240.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/63204837508.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210901140945_0rxgom.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/81498419534.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210901_F95422341A1A50AD.pdfIn PDF document text
    • https://menu2uplus.com/images/file/sugekopinajiviwi.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/tupofegimovipimunidenipi.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/fenowuwi.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/80528704543.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090712174273499.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/darugilebumoru.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/42080323419.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_off0000b9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DE 16116 bytes
SHA-256: fd49577f77448576e00c804eb40aaf74acce72f62cb6ccaae2741ca9e5c8a95f
font_02_sfnt_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 10716 bytes
SHA-256: 0acc9aa1bad7580158c65c8eb60597ccdd38973df7d19816ee79e69f6d636af9

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