Malicious PDF — malware analysis report

Static analysis result for SHA-256 1982427751807460…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 04:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af3bf517b5866a8fd2c5b3faf0f5e04b SHA-1: ee0823306dd55ae7208c32b5147e5e78b16fc557 SHA-256: 19824277518074602fc6b48d77f17838aa586f822c513e7540c5e5157f17af41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable or suspicious domains, suggests a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to funnel traffic to various sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggests it may be used to deliver further malicious content or lead to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://yilbasipromosyonu.com/userfiles/file/43282875339.pdf In PDF document text
    • http://vantaidongsaigon.com/uploads/files/ginavarerufa.pdfIn PDF document text
    • http://hkwwta.org/userfiles/palevomafosozofalamimam.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/71913029496.pdfIn PDF document text
    • http://scro.ru/pic/file/48532494790.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/42337169038.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/82507071934.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d4306d992---nefutuguvebiz.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/41986405347.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/40031897262.pdfIn PDF document text
    • https://dafelia.com/files/webolerijajamajudiduk.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/37279508677.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/61607367304.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/rozebatuwu.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210916234326.pdfIn PDF document text
    • https://tierlistei.ch/downloads/92955716876.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/bunepumuku.pdfIn PDF document text
    • http://kmsenior.org/file/files/ziwusalo.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/82304073691.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/31274593977.pdfIn PDF document text
    • http://dgjst.com/upfile/file/buvirifa.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/kakerif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=redmi+note+10+pro+user+manualPDF 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_off0000ae4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4C 10872 bytes
SHA-256: 789c829adf3f8a93800d9d206fea364bbde4af4679eae2a5f00d613a93a79520
font_01_sfnt_off0000c765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC765 15264 bytes
SHA-256: 5cd4143c422520fdfd2c8544c23ca94016c983353941bd385ad55bcca19c1d1a
font_02_sfnt_off0000ee6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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