Malicious PDF — malware analysis report

Static analysis result for SHA-256 300bf858a986795d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 14:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1faaf6c3b09c9341ca2f99bfbdaa5ace SHA-1: cf9b1cbe8209c191ceb8d6840da46c22be95b3e2 SHA-256: 300bf858a986795d9faef88b2808180558768ac18e5ccb073d502576f9f25c97
146 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The presence of a link farm on disposable hosting, coupled with a callback lure, suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a detailed analysis of its specific content, but the overall structure and heuristic firings point to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://garnet-medical.com/userfiles/files/60893055604.pdf In PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a9bdb3fe0---witogubidogebusu.pdfIn PDF document text
    • https://majubesar.com/contents/files/54061045264.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/gelutasetivomotuvanov.pdfIn PDF document text
    • http://oris-am.com/editor_up/30848298943.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb69baff78---lexofofo.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/zugifudivakedufunazo.pdfIn PDF document text
    • https://spacio.hk/attachment/file/wewimemiwaxipaxuz.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/tepimebunulivuju.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/vetugeli.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/jepulukaxorod.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/xalunezimapujujolaporiwe.pdfIn PDF document text
    • http://jsdarvin.com/files/gobapase.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/84004786351.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/lurufowiwebusido.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/32409828950.pdfIn PDF document text
    • http://vipdiler.ru/files/file/sutafigagunureni.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/jawolamiluxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=nintendo+wii+emulator+download+for+androidPDF 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_off0000dcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 17780 bytes
SHA-256: 3c2d88eacbad5e3cbc6274e236253e51cf85abfe2061c4d3d5c4c22f3eee5653
font_02_sfnt_off00012314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12314 10512 bytes
SHA-256: 81815732a1a8308f8c35f80a69ee48d711bedebd6dbab4dde2e20a172f54cb6a

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