Malicious PDF — malware analysis report

Static analysis result for SHA-256 055a5f1b19efd1ad…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 21:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c6126288a484524c2bfcb1e7b61179c1 SHA-1: 439599f7abddc4e8c570caa4c2103cd98c1cd382 SHA-256: 055a5f1b19efd1ad99fd696c8fb58c0a2dfd1c4384d9e74bd10a2c3c5de31ddf
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URIs pointing to unknown PDF files on suspicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a potential attempt to obscure malicious content or distribute further payloads through these links. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://affordans.com/ckfinder/userfiles/files/71017050833.pdf In PDF document text
    • http://sgo-bage.com/public/files/files/nevijire.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/vavegixuzepinufesevu.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/kejupowukigu.pdfIn PDF document text
    • https://mcsfood.com/images/file/34809342279.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/zugixapurovadida.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/99219088957.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/4710663595.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/18978722.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132b843dcaab---zejazidov.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/sirorud.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/96961901105.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c029dac7c---lepekuxasugepalufelej.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/70213114629.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/57774680896.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/wuwevezosularitigilewako.pdfIn PDF document text
    • http://ombs.ru/uploads/files/tiposevupusivavosamomuk.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/51588005636.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/90999993352.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/19438709531.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/30884175017.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/18329770317.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/90258694133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=english+words+beginning+with+sPDF 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_off0000db97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB97 18040 bytes
SHA-256: dff50bfd01e43da93074c6173ba9c448d44b29882077d85d2e2aa9318a1f029b
font_01_sfnt_off000109d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D9 10576 bytes
SHA-256: e4bbb8d203df7e8a531ae105a2f0a6cbcb9ed81a41008067fd79477d26128490
font_02_sfnt_off000121b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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