Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b31f32aaf8bb3b1…

MALICIOUS

PDF

70.7 KB Created: 2021-09-12 01:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f21de51ff8897cb693818414457a2a1c SHA-1: 647771f90e534542c9d2793899be9815f96dfb0d SHA-256: 8b31f32aaf8bb3b13ae30a9adfd5b98d3171915daec88edfad5f22b6746e7be5
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to PDF files. One of the embedded URIs, 'https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=download+speed+booster+apk', suggests a lure related to downloading a 'speed booster' application. The presence of multiple unknown URLs indicates a potential distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4326

Heuristics 4

  • 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.
  • 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://tropo-design.com/ckfinder/userfiles/files/15157935413.pdf In PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/84268295054.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/35130893110.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/kisalamakuse.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/46912835948.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/noxibi.pdfIn PDF document text
    • http://rayer.cn/d/files/8751668789.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/givasimorapupepab.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5aq06c4c9onjc1174jo5tcpjj4/sovemadumelofigafivinaka.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/guporawon.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5cd789182---mogipukapudepewevuda.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/19027806222.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/jonozalov.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/kunerode.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/32376334408.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/50461518304.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/xetifoleberozuzijedujepis.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/16261584478.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/48258374573.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/34062831441.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/wabowupel.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/valanowepafalugozime.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/lovirenuza.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/vomokutajunomesar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=download+speed+booster+apkPDF 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_off0000c3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EF 10612 bytes
SHA-256: 5a4d93433cb15ff6f84f817429f9c3fe50a55da51eaa07ec4923cc412723760c
font_01_sfnt_off0000dc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2C 19356 bytes
SHA-256: 64063c1a569b481faf21b21bd31cc36a71445335968234460c7aecc3b533fc12

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