Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0feb41e2cd95f8…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 07:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90517413956d95fb94676436b9d7a4ed SHA-1: f5a123f5b6a9836c66ce5b4f600274ac4d8be0a6 SHA-256: 8f0feb41e2cd95f8c7b8d6e5a3e96a86b0b00695142ddcb6d0ecda830a3c309c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' and an ML classifier indicating maliciousness. It functions as a link farm, embedding a large number of URLs, many of which point to potentially malicious domains. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://discovery99.com/userfiles/file/fimegoxetob.pdf
    • https://kompaspt2.com/contents/files/bivepuzatapode.pdf
    • https://marcvandewiele.com/userfiles/file/33909938053.pdf
    • https://signatureshreyas.in/userfiles/file/74234608751.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f36106dc22---40021287613.pdf
    • https://dom4m.com/userfiles/files/84981217732.pdf
    • https://pepsima.biz/files/file/kejafimitojageduked.pdf
    • http://szerecsengyogyszertar.hu/editor_up/fisanafusemafekubagufukid.pdf
    • http://chrislahoda.ca/userfiles/file/kopilaxi.pdf
    • http://targhevaticane.it/userfiles/files/62043303347.pdf
    • https://garraldaarquitectura.com/garralda_userfiles/files/91816773288.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sarotew.pdf
    • http://vswet.ru/f/39468381851.pdf
    • https://mvmdigital.gr/files/files/50296027219.pdf
    • https://sinarwaja.com/account/files/39788495222.pdf
    • https://vpmemorial.net/images/file/towatojakiwekodekugib.pdf
    • http://terrietanaka.com/library/files/19132540936.pdf
    • http://a1climbing.com/userfiles/files/sopakusope.pdf
    • http://duepassidalcentro.it/userfiles/files/41221090503.pdf
    • https://vildmarksjagt.dk/userfiles/file/xanumovujenenopelosozagix.pdf
    • http://cbstav.cz/file/funugidisorupudujijin.pdf
    • http://jucal.es/images/file/35323601484.pdf
    • http://frickcontrols.com/uploads/files/mozuxumufabulegamejik.pdf
    • http://gostinica-domodedovo.ru/files/41340033334.pdf
    • http://deltools.com/userfiles/file/judalozegadizojarokaxapi.pdf
    • https://foodsafebox.com/ckfinder/userfiles/files/kibajifuguj.pdf
    • http://moto-bike.pl/userfiles/file/61564200696.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ninja+fishing+mod+apk
    • 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_off0000b4d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D3 16792 bytes
font_01_sfnt_off0000cce5.bin
c80132ed273b5281f665d1c0e05481081b2ee16817c39b15906179ae112c1c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE5 15320 bytes
font_02_sfnt_off0000f37f.bin
9c23f69ecd6aa2cb0338c39ae346788f0810022eb7cb978b9832468228373086		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 10768 bytes

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