Malicious PDF — malware analysis report

Static analysis result for SHA-256 39aacc46e160cad3…

MALICIOUS

PDF

78.8 KB Created: 2021-09-13 14:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab38f39420cddaa3b2671298f9c883ab SHA-1: 95edc7c36fe41098c274c4ef3b04c258cb1fd968 SHA-256: 39aacc46e160cad364e8073f190137942323f81084c7a6a2a90f6d1f4113852a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a491441c35---bebizufexilomuvi.pdf In PDF document text
    • https://getracemirates.com/userfiles/files/32565433478.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/xumafutosad.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/doziwanegijam.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/nokusabar.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/89335836011.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/38889617242.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/16388291483.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/jovufutijif.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/foregotisabizipowik.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/lojevuzavimolebotap.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/goropodipugapudopub.pdfIn PDF document text
    • http://zae.me/datafiles/file/nefovizok.pdfIn PDF document text
    • http://ing-ka.com/user_img/file/ziputamimagofaju.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/91792121104.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/81241805223.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/87920011249.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/44564759213.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/nufavevujuparixopovejusog.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/82005775283.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/3484710797.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/59452311836.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/toxipezogujez.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/861038852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=game+one+piece+android+apkPDF 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_off0000d38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 10496 bytes
SHA-256: 25c629d954b68c17757392f753e769dce7f4218e9e4cd69e7ed470cdc6170a38
font_02_sfnt_off00010367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10367 16388 bytes
SHA-256: d6da8fdbbcecdeab1a3e8bfe80418a2a55b8181e9185f3dcb1e2fe7ec5102ccb

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