Malicious PDF — malware analysis report

Static analysis result for SHA-256 29fb512b777c65b1…

MALICIOUS

PDF

83.3 KB Created: 2021-09-13 12:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 42d37525ae96ab9bdef753630385d96f SHA-1: 763dbb4298fbcc6a383d3bf2db70914a088aae74 SHA-256: 29fb512b777c65b10bd4197cc0c09b0a16135616bfa2b506bd035b80145e2538
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous links to disposable domains, indicating a link farm designed to obscure the ultimate destination. The heuristic PDF_RANDOM_URL_LINK specifically points to a suspicious PDF hosted on goldendoodlesofthesierranevadas.com, suggesting a phishing or malware distribution lure. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://oodow.cn/upload/file/210912011810400715gg7pz0j6kdpr.pdf In PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/98016262166.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/79445250325.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/gejopelobofonubeg.pdfIn PDF document text
    • http://dnepropress.net/files/file/87514881595.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/37992553863.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/90320389525.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1630671326.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/15435390122.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/sunulitusamaligubexol.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/11933778428.pdfIn PDF document text
    • https://kaisar168.com/contents/files/lovefinegabatinojera.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/24617198078.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/826c205290a0eb2a30f7a1e00261d0af/5781199844.pdfIn PDF document text
    • http://eichler-kammerer.de/xexawunisagozotirolokal.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/73510384579.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/bawikufumido.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/doxebejubolajelinuvi.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/53254279197.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/disut.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/32253516924.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/sosuxav.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/101316568056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=magic+call+mod+apk+unlimited+creditsPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD014 20884 bytes
SHA-256: 3a6ead6aec92dbc28f4764cd16c6df2cd91ca70aa8bcba9535e923a40a09ebe2
font_01_sfnt_off000104db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 11040 bytes
SHA-256: 88e1ceeabe9199eaada78ce44ad46e56ee9d88614da44fca1f99f4afffe3d897
font_02_sfnt_off00011e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001366d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366D 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c