Malicious PDF — malware analysis report

Static analysis result for SHA-256 116c45b978b32f98…

MALICIOUS

PDF

67.8 KB Created: 2021-09-27 06:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 36569aebe2224a244979c98937373357 SHA-1: dac7b3d4f4803d6497f50442940b6a7c3a4fc9d8 SHA-256: 116c45b978b32f9838c220e0f60f3bc5d1cbeb07be4b88a933251f109c34c9a2
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains an image-only design with a clickable action, typical for tricking users into navigating to external URLs. Several embedded URLs were extracted, including one pointing to a raw IP address, suggesting an attempt to host malicious content or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://saaretravel.ee/images/file/90207362310.pdf In PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/fuzerazulimod.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161303153893dc---13732932918.pdfPDF link annotation
    • http://trunglam.vn/uploads/userfiles/file/20193693129.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/xitakawawopam.pdfIn PDF document text
    • https://flyags.com/editorResources/file///xusesesosotila.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/juboto.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/lumazoguke.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161319adba3441---5907921824.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/birum.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/lovupulebiboridadotono.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/12504864106.pdfIn PDF document text
    • https://phr4u.com/files/xitobizaromixofazotaz.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/vulatozum.pdfIn PDF document text
    • http://spaconsulting.pl/userfiles/file/selafemusijoridajoteza.pdfIn PDF document text
    • http://akademibt.com/resimler/files/54319042984.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/faxakekof.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/puwalapuwexege.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/modebubijinefamadonuvodim.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/30315502617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=dirty+games+duet+read+onlinePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49D 10804 bytes
SHA-256: 46f11c4cdf04ed0d5a0335c6a0667d1722172c85eb08ece991aba270680388c1
font_02_sfnt_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 13996 bytes
SHA-256: 8522987a3caa5243a733c20f9bd449fcb95a0e31e2e7bff2cab526118ed73c86