Malicious PDF — malware analysis report

Static analysis result for SHA-256 5390cf9967009b74…

MALICIOUS

PDF

78.4 KB Created: 2021-10-08 13:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a1b1191a34d0cfa892b464a3e62f7b30 SHA-1: 370fc544ee5beac1513976732041b2bdc5fe3914 SHA-256: 5390cf9967009b7440ab97636a5eecff9de4e54f5a74a10f1d8df7ef3ec9dd64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The embedded URLs, particularly the one pointing to 'picassogift.com', suggest a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing and scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://picassogift.com/Uploadfiles/files/55711543748.pdf In PDF document text
    • http://serdceprirody.ru/userfiles/file/lemebapakipomif.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/xerusunisa.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/zenugudadejejagebavinug.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/garav.pdfIn PDF document text
    • http://birdwatching.sk/media/file/72875429405.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/80456155067.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/gasereb.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/valowopigamafikupef.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/2109030321057747165nuat.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/39790529532.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c918c41c7e---2475927410.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/lefojimoziwebama.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/55969519789.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161587fcc64ee4---mafufexapom.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/lotosena.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/19007716793.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/77670056488.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/5505610364.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/bojofijonagotukedixaze.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/19339894158.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-10-02/102ad64d17014aea9a665dd6417193de.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/78288915218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+get+followers+mod+apk+unlimited+coinsPDF 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_off0000c8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C5 18372 bytes
SHA-256: f418c0b2bd659d92b2da13d82ff55e4fc531211a8198529fb6b71e3cf2a703aa
font_01_sfnt_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FB 11240 bytes
SHA-256: 359a173c91d5d1822384fc457a8c93c0f3dae2ed93a28d59cbec704497a4fe90

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