Malicious PDF — malware analysis report

Static analysis result for SHA-256 812e4e5bdca1a15d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-23 19:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff2e0eca010c3e2cf626272171272ec9 SHA-1: 6347323509e8469245e11d924d7c8dbc4914c5a3 SHA-256: 812e4e5bdca1a15dc92cd6deca82d0bf808f468d0bcfe5749951a53ff9fef2b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=libro+diagnostico+organizacional+dario+rodriguez+pdf PDF link annotation
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/sabimodoz.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/11049910590.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/536562591.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/fetisukumisebedijavexoge.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/24871678023.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/zoxesised.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/51322778608.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/mageladen.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/95478247257.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/32933308223.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/fajagawanojis.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/pajomejezivomugidabuna.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/fobipipenijesi.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///mutuwubajekasasupironuwe.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/95066956470.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/laxuvavemudolifawipijujif.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/5434032976.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/zebibufese.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/31303178255.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/renifot.pdfIn PDF document text
    • https://scalper.ir/data/files/file/xobokekafedu.pdfIn PDF document text
    • https://phuquiland.com/upload/files/93281924679.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/saduzemavixilasor.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/pubigagolovonofadogiv.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e5f852e4b---jamexamebemafew.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_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 11052 bytes
SHA-256: 0ed2c8e05f8350817c13b202190c0883313d765953424988932f04d21e32c348
font_02_sfnt_off00010be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE6 18652 bytes
SHA-256: b33540cc9b9990aea77629b31ee26114e879fac2fca7930e1291573e04f117b7

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