Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba45130bc9a0e482…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 22:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d372f6ecaa52b569916e74dcf09f58c2 SHA-1: 84f714bd6ef2b2f1682b4015399067fcc28b9a19 SHA-256: ba45130bc9a0e48246d9b75eeeab04469442e182698ee1abedf7ba87662a2826
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external PDF files hosted on various domains. The presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://ty6600.com/userfiles/file/9669250152.pdf In PDF document text
    • https://servicepapik.ro/files/bidewuw.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/detofidebebibepolezumame.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/47455433758.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/75657701619.pdfIn PDF document text
    • https://tarsiman.ee/files/file/95890824175.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/jidejas.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/92295463898.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/ritorovapux.pdfIn PDF document text
    • http://onelove.cz/file/wudesanabuvifavejir.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/67270255772.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/rogunafilepiresogofanipev.pdfIn PDF document text
    • http://mlead.net/images/e/file/2178370063.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210914021839079.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/a4c2ed0e5ba00c8a6587a1e0d1c5a4d6/miribatanoxifadesajepo.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/suboluwobirezefudiki.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/fudafoxuma.pdfIn PDF document text
    • http://schokobrunnen.com/idata/19651935700.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/6696858853.pdfIn PDF document text
    • https://www.parcdelorval.com/ckfinder/userfiles/files/rogesiwobamekufemaxawuwo.pdfIn PDF document text
    • http://fruitvita.com/files/files/kizalibu.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/49277554354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sad+love+quotes+for+herPDF 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_off0000d1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CD 18368 bytes
SHA-256: e1fd55f2eb0c80f7cd3468f1273f897e0f65b610dc14acf0d51d97dd373b00eb
font_01_sfnt_off000100ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11906 10644 bytes
SHA-256: 2cc277eec535744269ba1e626e0af961475c8b93d9dc72969b801f48550e879e

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