Malicious PDF — malware analysis report

Static analysis result for SHA-256 e968134ce6af8dd3…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 17:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99efff072ba166a1f8064aa2ec298183 SHA-1: 23f1671bd3ad8838b4b82d54a73fbac5222f4142 SHA-256: e968134ce6af8dd30ad01988f766d4321b261520e16d4c3c754d2a214fbacdf1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. It contains numerous external URIs pointing to potentially malicious domains, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/uplcv?utm_term=score+hero+play+store PDF link annotation
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/xamezakunugotanewame.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/sigabojofux.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/kisozavimililapubinazev.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/4350132944.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/dopeluvikexamabu.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1631179019.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/tolumirewopupujez.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/daxufitajuxidesad.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/rakapu.pdfIn PDF document text
    • http://sns.hu/_user/file/vobutirifugep.pdfIn PDF document text
    • https://unaizahic.com/Files/files/49914631056.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/46523554704.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/20458631586.pdfIn PDF document text
    • http://ternovykh.ru/content/file/tozetulogepit.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161381979cca0a---46616778284.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/17466077264.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/xuzodulimubobu.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614167d056e10---31423478110.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/37470663422.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/88077333262.pdfIn PDF document text
    • https://aneri12.eu/res/file/36346038594.pdfIn PDF document text
    • http://naso10.com/userData/board/file/pademogamunodajub.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/givevewenovowenutunaluxud.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/nafagitufeleki.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_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 10464 bytes
SHA-256: d28d1524ff08d519fa660d7126f9ef38d952ecd05ad2cc4e17c31eaf5e6b926e
font_01_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 17676 bytes
SHA-256: 0adf310b8c679b42ee592dd0d85e2b2f53d203a1d4b5fd3f5cf083bf5da688a2
font_02_sfnt_off0001289d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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