Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b58ff8aab5e812b…

MALICIOUS

PDF

76.5 KB Created: 2021-09-17 19:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28b6812da3e2483e688ed411467ede66 SHA-1: 27759f5a38075451c95954473bfff7bf2ef04d63 SHA-256: 8b58ff8aab5e812ba99dee0224a9f7338cc4b6fd2a638fddaea30c9462d2d738
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, one of which is hosted on disposable infrastructure. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • 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://westpakusa.com/phpsites/vertical_living/uploads/file/32821235703.pdf In PDF document text
    • http://ecme.site/2015/vat/upload/files/mozitatidovobizawug.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/34597524108.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/69255544736.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/390065599.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/9gj268iojhps0djlkacobekosh/tovelivezamamure.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/30104768628.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/mefewazofitenevu.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/rokawumol.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/9676127409.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142d0177230e---fojexowewexajetodefoxo.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/38156005687.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/37448711771.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/91450627236.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/75113841755.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/6434870203.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/jedofizopepigotafakulefu.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/13949650123.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/1514209742.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109091322471200.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/wokokaw.pdfIn PDF document text
    • http://hasekei.jp/userfiles/file/daseresagumitevoximizi.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/17543643176.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/bitepoxubasiripaxovilapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=usb+tv+tuner+price+in+pakistanPDF 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_off0000c94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 10608 bytes
SHA-256: 32baaab2dcc0e648d51c97a41b31dabca84184c2617ae04f436e0344a0b405e1
font_02_sfnt_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 16508 bytes
SHA-256: 605c3805dfa7c80f7c2b13fb4c808c23efaa5827bfd0817651f9ddf5dac90f9d