Malicious PDF — malware analysis report

Static analysis result for SHA-256 b346dafd8d3b9b91…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 07:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e750c3edc29490ba2a09e70d97ee2374 SHA-1: 21ac727b9fde9e83ce25055c5b1e5d828af35b31 SHA-256: b346dafd8d3b9b91ed74429b6736a4a26c5ca2ca415ca8b46eae8cd5ba482d75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://contelex.it/userfiles/files/38349791265.pdf In PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/jalefutabediroj.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/46lqs4u94ql4upc305hrr8pa52/43562757633.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/mafutivutafevebifozu.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/84349273116.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/jarasinuxesumef.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/93155704406.pdfIn PDF document text
    • http://yanartextil.com/firma/files/31476108765.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/85919152253.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/kolokejodinegepotikuf.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/vekidalukegenibazajano.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/dulokisonogopuwe.pdfIn PDF document text
    • http://www.moyekolodin.com/files/figipipazimofugovosutu.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/66872572015.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/868714499.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/21470006725.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/gepoj.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/44617065826.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/jimufuvez.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/jubarimixovu.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/livokawerezusijiku.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/36707666369.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/34027085108.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/relopijodifesukar.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/89798784773.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/zatunalobox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cara+buat+akun+google+androidPDF 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_off0000e0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 10620 bytes
SHA-256: 26a9b8d79f5575a589db94a61fba13ea49f21104fe432b663322934a3c949a25
font_02_sfnt_off00011100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11100 16800 bytes
SHA-256: ee9a1b0da574d44547164fd51a216b168d26129b51259ae3a18adf2d8db646af