Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fafc3d5ccb9205d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 14:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5e150e790b1260ebec8cb8ca6d04787 SHA-1: 8690339d188aab0f1f709998858e259e65365d4d SHA-256: 5fafc3d5ccb9205d0eddbfafc81bfa7d548fa3e14a8b8cc578e87fae84b244a5
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ClamAV detection and the heuristic for a link farm on disposable hosting strongly suggest a phishing or redirection attempt. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3798

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://musorcentrum.around.hu/files/article/file/gazugasokabunoxawur.pdf In PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/xisitupejiritixefemolin.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/duzotamegitunudidinadusu.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/mizudipukuxirop.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/45747226083.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/32394958493.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/xipilulam.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///gusukekalukonunedu.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/nuvelumuvunalut.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/72615899977.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/telajobipekulotuke.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/8179434252.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/ritataje.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/25593904366.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/wovasapumizazezubalonez.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/disuxubizumukuzavoxuvu.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/vujunilimodidomerewelewu.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/81653229478.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/17449041489.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/zosejasol.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/detusasijojojax.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/68227227222.pdfIn PDF document text
    • https://educhina.mn/editor/files/zugidajuwelutusuwafubewe.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/pedezosumulole.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/nosepulejedes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=online+vertex+calculatorPDF link annotation
    • 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_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 10348 bytes
SHA-256: d681b2e504d675cf783ac63223a771fd122b85d8bd80256f86df95941d690b3d
font_02_sfnt_off00011721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11721 18540 bytes
SHA-256: 778ad839d3f4d1264bed32c34bfa6e7367f5ea8e28cd77df9f816d9884a316d5

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