Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb0533d557c3c01…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 16:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 94e201f80715ec0cad11e76cdbfcd618 SHA-1: 1a3dd30b6c51f18780acfdad0cda4342ac30d79c SHA-256: ffb0533d557c3c01ba689fec418288911b976e6274546e099796623a3077de7b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with numerous links pointing to external PDF files. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://matao.ro/app/webroot/files/userfiles/files/31766447443.pdf In PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/bimuren.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134a3ac6016d---nirixisenuvaxesejosuvab.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/dilefedokevenoxi.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/73627313317.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/14602682501.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/62414084069.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/92926934693.pdfIn PDF document text
    • http://orthopediedelft.eu/files/53712728532.pdfIn PDF document text
    • http://etre-belle.su/images/file/35379704157.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/12068857470.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/soditizevotatepobaxe.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76736346357.pdfIn PDF document text
    • http://babamoleskine.com/files/file/datoselilaxojuxejewosoxa.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/vipugixewugizufumilebekuj.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614407d0a28ba---bireneboxijotalopomujalar.pdfIn PDF document text
    • https://rafautama.com/uploads/file/soxeruz.pdfIn PDF document text
    • http://protezas.lt/i/File/53169437627.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/82161138763.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/77776346262.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210907191548.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/sudazubeki.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210909_653603E348AD0E6E.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/luvabexofajomuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sims+4+free+stuff+packsPDF 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_off0000d488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD488 16592 bytes
SHA-256: 221d530c6bb3d18df7fd61e14a466849c9cd4ef9d5c7d1c675e0f5d733b59b37
font_01_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 10716 bytes
SHA-256: 106617835556eeb24267cf106d5ea7d512c4c2e5d075baa6b9abb7bfaf8f8c7a
font_02_sfnt_off000117e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1