Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c48f98e1966b248…

MALICIOUS

PDF

81.6 KB Created: 2021-10-19 22:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a1214ddcaf91d2f96c0c6113a2df10d4 SHA-1: fc127351b7671f025f2e7bc3161e99a7ac0a918e SHA-256: 2c48f98e1966b24878611f9ef90efff375303fe55c206701f8c508ceaad2a5b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URIs and the overall structure point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=worksheet+8.4+trig+word+problems+geometry+regular+answers PDF link annotation
    • http://csigikes.hu/admin/fck_upload/file/40910732281.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/nabalidibiromatiwa.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xopasevirosofuwase.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/16765615070.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/pibiserozisita.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/75631638535.pdfIn PDF document text
    • http://kcwoman.medsoft.kr/pds/userfiles/files/guluv.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/49738008221.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/28138914317.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/75955563125.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/wuvikikofoz.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/wonekowedusat.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210924215459036.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16145af4a4869b---76982480939.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/76620669012.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/044b6d63da1aa232dee81b529a832095/vajufogok.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/3969650191.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/40327657788.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/93352138999.pdfIn PDF document text
    • http://7profi.net/userfiles/file/79290495349.pdfIn PDF document text
    • http://zuche0551.com/upload/file/71087491216.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/77677176497.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/65281926702.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/82813036294.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_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 17908 bytes
SHA-256: 13fc4bffec5d75999e1a4bb208a07990c3a25eb5c945720a1c8842101ed6fc1b
font_01_sfnt_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 11716 bytes
SHA-256: 2399a88ca8d00223fc6228d7114017d04531d042e92ef8060498dd986f77d3d4
font_02_sfnt_off00012055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1