Malicious PDF — malware analysis report

Static analysis result for SHA-256 4feb33118fbe3005…

MALICIOUS

PDF

76.3 KB Created: 2021-09-17 17:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e63629ce1ac9bd00d669b032647aa19e SHA-1: f8707a3e110c7ff5514d5b84ab29492938c6d3d6 SHA-256: 4feb33118fbe3005798cdf9bce51728b4cf9cd3c06c2e33818687044c1fe036c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with one identified as a high-risk random URL and another as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161328c531df89---xuzavexitakulokojotekurez.pdf
    • http://chinahongji.com/d/files/67942535321.pdf
    • https://ddtoyz.com/ckfinder/userfiles/files/kabuvaw.pdf
    • https://lnpro.in/ckfinder/userfiles/files/vuvafuwimute.pdf
    • http://pumarecovery.com/userfiles/files/surezowunuboveverobuwe.pdf
    • http://asckhn.com/acskhn/userfiles/file/nekegepafijujaw.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d48a704b0---gumut.pdf
    • https://askisan.com/upload/ckfinder/files/40004943260.pdf
    • http://gesundheit-im-blog.de/userfiles/file/fujibabowape.pdf
    • https://mar3ol.com/Files/files/ripizimawomuku.pdf
    • https://cet.sk/res/file/gagizerajisizezoxoba.pdf
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/patid.pdf
    • https://ambulatorioveterinariosismondi.eu/file/34553315924.pdf
    • http://www.bufolari.com/public/immagini/file/felutunedalas.pdf
    • https://kolbandibileklik.com/resimler/files/tevipijomiremew.pdf
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/xekeporij.pdf
    • http://anabakorea.jp/userfiles/file/76271797449.pdf
    • https://fivetc.vn/uploads/files/wibivezomuriviwanebev.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/67634432284.pdf
    • http://wedding-box100.com/uploads/files/202109071920442737.pdf
    • http://shopgraeagle.com/ckeditor/uploads/files/jakajedeziwosijadevagif.pdf
    • http://likebarcode.com/image/files/20210904_153829.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=gaana+android+auto
    • 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_off0000c932.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC932 16792 bytes
font_01_sfnt_off0000e144.bin
fb9b47c1359433880ce48d02e1aaa74db793175979d443199f382a1fb97c6f7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 16960 bytes
font_02_sfnt_off00010d1d.bin
05079726e090e4936a027536cc17d428e8794ee6575566d60632cd6fe0c90e06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1D 10032 bytes

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