Malicious PDF — malware analysis report

Static analysis result for SHA-256 da91b951ff00672a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 13:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0ff0d0ed1aa8a31ff5e1c40df4a32e0d SHA-1: b74b68c43b941c828bc99aa732b31cc857d5bbe9 SHA-256: da91b951ff00672a75a14002f555cabdcd8d7eb9fcf79e783894e4cee00aa7bc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external URIs, with a prominent one suggesting a download for 'photon flash player & browser update', a common lure for malware. The document body is heavily obfuscated, preventing analysis of its specific content, but the heuristics and URLs strongly suggest a phishing attempt to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smidgel.ru/uplcv?utm_term=photon+flash+player+%26+browser+download PDF link annotation
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebbfee8d34---97862071798.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/97714240485.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/8874572915.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/72500403743.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/jepamabijora.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/donadawobi.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/nokuwugif.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/kosekox.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/pofixor.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/numowijoferetaza.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/95547263258.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/97222078443.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/winedekivagetureniwipejew.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/ruseselotakisero.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9d0803f8b0d656018a882d3c8867afc3/64665340201.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/58331668987.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/sogew.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/16899748721.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/27766504495.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/mefugowotijar.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/kakexen.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/dezatavuzagijerekatola.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/noritufaweresada.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_off0000dbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 17604 bytes
SHA-256: acba2f753c0ef2b24843a4709221c904c3277068e2e5bf349647d18d3d2ad960
font_02_sfnt_off000121eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EB 10476 bytes
SHA-256: a02850f5a52c0dd5b82788e18fb880d9df18fbe9b964f14d85e1113965550e20