Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b5421d59c809c5…

MALICIOUS

PDF

75.6 KB Created: 2021-09-13 04:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 882bf2cf49a17ff86cfdecef8181195f SHA-1: 5081e8f19e8995a8fc44d93b8e245233a9710842 SHA-256: 70b5421d59c809c58dfe389d11e5b529743f00fff84e995671721bf56b98965d
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5631

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.
  • 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
  • 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://geologocarmignani.com/userfiles/files/vuraladokuwaxa.pdf In PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/47625578783.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/79763934698.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/raralu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613579c77fafe---20008547118.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/jubakulukirizuvevu.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fekeparuki.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/161313207aaef4---99143032938.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/20189644514.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210908051655.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/vedefemaketok.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210909003009.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/wojolomenidodafabugi.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/51489675472.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/nadataxazijanimozejome.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-11-13-59-41-93.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/padamadomejimi.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/birumofanojupop.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/wumokutumeti.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/galatotiderurekazafi.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/pewodagi.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/ratagabafejexudaf.pdfIn PDF document text
    • http://viorina-deko.com/images/file/54654610819.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/merivajifamis.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/beviro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=my+file+organizer+for+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA35 10428 bytes
SHA-256: 87bf229597aac0f28f7a5c2d3df98b184cb091cc51c3e0db3ac38b2049d2a323
font_01_sfnt_off0000f1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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