Malicious PDF — malware analysis report

Static analysis result for SHA-256 643451947797a103…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 06:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 46010aa6694e6e4742cee3ab3fc8a280 SHA-1: 32773b560931bf0df7394876273f1243bc7ee66d SHA-256: 643451947797a10328936c52984183c3001043615b0b24bd0bc8d40edb395c5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=how+to+add+bookmark+chrome+mobile PDF link annotation
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ke384e8nglo8bcgvuga2ebs449/peluweserajugaw.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/giwigoxowar.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/116980065061359f0bc9e02.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/nufukenuras.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/kagerokim.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/66772168161.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/96643341243.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/20388922564.pdfIn PDF document text
    • https://trystsalonri.com/images/file/sekenuriwidadefefagavi.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/97864974530.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/kidunamofix.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/wuwatebupamifatebuxeron.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/85108636517.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/kejopidejagatowesedub.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/39236911603.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0872346001631137591.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/jebarevivulinokik.pdfIn PDF document text
    • http://sayarbobinaj.com/file/30229620899.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/68849876067.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/r635ne0jikc9p50uub0v6066v7/niwitok.pdfIn PDF document text
    • http://contua.org/userfiles/file/79271736366.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/rolokunurakefuvaditezo.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/mupuzuvivisev.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/roninoperibiwev.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_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 18300 bytes
SHA-256: e53787dbeaae1d2635e2b3d4b2c5a3842de1a0c98b689dbcbad88622ac58020c
font_01_sfnt_off000115cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE2 10672 bytes
SHA-256: dbfcf1d0accaaf8d9f760460acaa3d1c05c191f6849b2777121253ac54dc008a

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