Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a530e5f05c46bd4…

MALICIOUS

PDF

74.4 KB Created: 2021-09-25 06:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d9071200e213ba0364a2ffd4969d097b SHA-1: a6d53b2e8fc80f5efc2a99e0aff29de24bc2ab02 SHA-256: 4a530e5f05c46bd48ef2699558dd26ba91813bf925925ade774da56a9b5bdcad
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it exploits PDF vulnerabilities to execute code. The presence of numerous external URIs, many pointing to potentially compromised or malicious sites, indicates a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that these links are part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/e105f5a5833e59dcc6916a5d52adeeb1/40428359048.pdf In PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/88148368076.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/22411129751.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/10452702249.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/sinifabezegiwesowanodivin.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/44359366478.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/sulazipoge.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/jopaxir.pdfIn PDF document text
    • http://artospace.com/pics/file/65785304042.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/pumivikajijokivise.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/78801835383.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/tupuwizinitemazuruf.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/sizetagokituratovo.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/62387435570.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/24554006209.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210914_1B21858F672F8104.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/75367429607.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/72844016392.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/motavedajaviz.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/jinipu.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/najamoludopimero.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/kapesegelepeme.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/kakajumivasanumuminodovo.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/judode.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210902_065411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=poweramp+pro+fullPDF 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_off0000bcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB9 18388 bytes
SHA-256: dcb4af2565dad2afc8c4c511396e2697d57a79edb49185acc1456d33c2b69a52
font_01_sfnt_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 10244 bytes
SHA-256: b97b0b22ca70080052ef77349b1b51b5a005750786f88f6df7ac26e9be3ea07c
font_02_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1