Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b415d7cc4b8459…

MALICIOUS

PDF

88.1 KB Created: 2021-09-19 00:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de3156421efee2176497ac0b7d756f1b SHA-1: 5abf34505fdca9876781e4b133ae411fd30a84aa SHA-256: f7b415d7cc4b84591d1773c0bbd748a7ce304e4e8c9cf98a33a9c1aa9702630f
166 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with specific heuristics indicating a social engineering attack designed to trick users into running commands. The PDF document likely contains embedded JavaScript that attempts to exploit vulnerabilities or download further malicious content, aligning with common phishing and trojan delivery techniques. The presence of numerous unknown URLs suggests a link farm or distribution network for malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://bompentax.com/quangbasanpham/app/webroot/upload/image/files/98613893983.pdf In PDF document text
    • http://obraz-tlt.ru/userfiles/file/tumamijipefagodulipuk.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/56016171690.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/kosopobuzixuromo.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/55787310767.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/3811497874.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/tabute.pdfIn PDF document text
    • http://contua.org/userfiles/file/46619067919.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/69151287224.pdfIn PDF document text
    • https://tpk-m.ru/files/file/sawepazariwunevibubufufi.pdfIn PDF document text
    • http://iscelenie.info/files/file/nolawusikoduruxuwudugape.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210902180531.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/getopavizenuzedis.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/bomeduroneb.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/sixeni.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/35978105146.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/a7ndalr3uvdb3a39bu1go2lch4/fulositen.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109171312586176.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/13301980737.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4f8075e4---90735953982.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/vobalomotubekenunal.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/95386931547.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/rizoninivoporibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=defrag+windows+10PDF 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_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 18324 bytes
SHA-256: f0cd6736c8a4d81ae9d5b4e8b563045c810da56c87149ff2c0f18be35abc7369
font_02_sfnt_off00013aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA6 10648 bytes
SHA-256: 6b3f394dbe127798b0dc0eb27326c6285fc970ddd1dff6572198d7bcd0d70594