Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1de7560e87e2d7a…

MALICIOUS

PDF

76.0 KB Created: 2021-09-11 23:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5aad88ac0c43073316df4e5076cef897 SHA-1: 72c1eb51b99658c146f73887d250171eef7b2241 SHA-256: a1de7560e87e2d7a5f91f6c6cb80d7b5928033dd2fabbf028e705281cbb2d2f5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=diamond+hack+ml+without+human+verification PDF link annotation
    • http://petraifevronii.ru/ckfinder/userfiles/files/16495383050.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/fiwizesuku.pdfIn PDF document text
    • https://polandpools.com/contents/files/kipawadon.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2d197d89---62817041045.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161384f1ced189---fiborixenudo.pdfIn PDF document text
    • https://bak.vn/upload/files/nabis.pdfIn PDF document text
    • http://hzqzg.com/d/files/71067564558.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/fexebi.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/16951942161.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/44914950124.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/bawubilewalebupurevaxak.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/8096561625.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/36168937607.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/92248556933.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/jevojuwemofamafojubiwan.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/43544516044.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/gukavodewutinujevudugumab.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/lamotomavunudozipetozaf.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133fcc333a4d---bupazuvovonoza.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/73420696313.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/gefekupuneso.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210903_E1799E508663C24B.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/xudisumalivizaleti.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/13118332494.pdfIn PDF document text
    • https://greenways.at/userfiles/file/rifewevitoderiruxuzuj.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/tekenevegiropaje.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///30945360248.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_off0000c4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 10920 bytes
SHA-256: 97f1dd074d1c8b5a84417f7a3c4d935fcbd75529851b14d8c1b8787147fe7e17
font_02_sfnt_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 17276 bytes
SHA-256: 379a2bf6fa70129e636322b7f62e8c031b777bd2ab5b9c1481e014bd73eb7718

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