Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7929a4a957738f…

MALICIOUS

PDF

73.7 KB Created: 2021-10-01 15:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 258d9f442952bd7777fadfde2d8dd5fa SHA-1: e133eed2e358b6c2cc12f846f44cc42fcbe0eb5e SHA-256: ec7929a4a957738f9bcd0e83772aef2843b4f1168f9ee926b6fb7cb050e25531
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to a link farm, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://paroissedementon.fr/upload/files/nuwukatitixoputojozek.pdf
    • https://hotellemaritime.com/hotel/upload/files/98109600512.pdf
    • http://kargo-box.com/uploads/files/72323124700.pdf
    • https://vzglavniki.net/data/file/jenesokideguwesoso.pdf
    • http://gtlitalia.com/userfiles/files/xelunejemolevo.pdf
    • https://congnghieptauthuyvietnam.vn/upload/files/88534897552.pdf
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/98989065716.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/10ec04bfb3a194138eb74c7e3b6a107e/87179474128.pdf
    • https://keongracun.org/contents/files/61639749511.pdf
    • http://kidneytracker.com/ckfinder/userfiles/files/xunigepabosakija.pdf
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/nadupafozeti.pdf
    • http://rcot.by/pics/files/gomobenudu.pdf
    • https://cplastik.eu/data/cms/file/41222988604.pdf
    • http://belly.bpv.su/content/files/files/bebexudopama.pdf
    • http://www.hangmandigital.com/files/file/36518142469.pdf
    • https://hanoihome.net/img_duhoc/files/jajad.pdf
    • http://worldtile.net/jangheung/userfiles/file/20207505336.pdf
    • https://naves.cz/res/file/33849050236.pdf
    • https://birsamundapark.in/userfiles/files/nalagapip.pdf
    • https://kingwaterpure.com/ckfinder/userfiles/files/44423882784.pdf
    • http://gdlianyu.com/uploadfiles/file/nizowegaxepakojalizifuxo.pdf
    • http://hejia-ele.net/upload/94337965938.pdf
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/wadedapib.pdf
    • http://gist.adrianlechowicz.pl/userfiles/file/34421928307.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=notifiche+push+android+non+funzionano
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb47.bin
f7325da56c27c129b38d8c60ac62fdb4bd087086441dbfc5dad01f563d0b3045		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB47 17524 bytes
font_01_sfnt_off0000e86a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE86A 16792 bytes
font_02_sfnt_off00010081.bin
55e9816ba73a6038023a232c176b3187320932bc8568c95994231fb0066707aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10081 10808 bytes

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