Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35b9028b2c7886e…

MALICIOUS

PDF

96.1 KB Created: 2021-09-13 14:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6aa6440f0b6b5c4e3d16e4aa6bc38c4 SHA-1: 79335e376c75c4ea35763a009c4082adaccdad38 SHA-256: f35b9028b2c7886e6bd77f12ff1d782bac8e917b82bd6af0e218d0ec69802e32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains a large number of embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The file's metadata indicates it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which aligns with the presence of numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=free+ways+to+increase+instagram+followers PDF link annotation
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0d4a66e7---lufewadegubupa.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/bebineziso.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/2011404005.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210902033031.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/kawuwuzekijir.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/tosiruwowas.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/xidaxuguzurunikajo.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/vironasotapovitoxa.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/4d1e3eca0bfb9cf02614708214784722/79131130804.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/sasalonexinobaxefi.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/bujexuribibupej.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/31272484762.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109081253086749.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/13215734427.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/45046626927.pdfIn PDF document text
    • http://donghotam.com/luutru/files/tupogaforoguximetojogitog.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/76362782365.pdfIn PDF document text
    • http://change4best.ru/upload/file/todojur.pdfIn PDF document text
    • http://cbstav.cz/file/90648225187.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/6666732431.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/68551574602.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/gomuteg.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/90702204728.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/vutivujalozofoxogoxada.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/xorokinitelagipekagikavek.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/63236568595.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_off0001114c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114C 10856 bytes
SHA-256: 035f15df50bee3638f11c5509c2a6f977d65289e3704ac01daedb1c2268ff118
font_01_sfnt_off00012a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14284 18416 bytes
SHA-256: 70640cb3a827ff569787482941f2ca63fc20fc6554532e2c98f8b020482e083d