Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32032afcca4755b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 04:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e852a83d86763566f46d0ef256845d4 SHA-1: 2286d3dc4e083bb2fbae7d269459ac8fd9a02e8b SHA-256: d32032afcca4755b38c03aa47129d126baa0abbaffcf3320070d44cec72e9302
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://planao.com/ckfinder/userfiles/files/jobusawefor.pdf In PDF document text
    • https://huuphongplastic.vn/uploads/images/files/konuba.pdfIn PDF document text
    • http://roocenter.ru/upload/file/8221276556.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/94469435286.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/tidiwojojapisorewuwima.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/93983243628.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/19306961102.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///39070527469.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/xuvovobenusosevuxuwa.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/99306474460.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/govudin.pdfIn PDF document text
    • http://aven.su/userfiles/file/kodapukogefariweputavi.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/21844845840.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/5677435077.pdfIn PDF document text
    • http://premo.at/userfiles/file/90830050028.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/numabazixo.pdfIn PDF document text
    • http://www.miwon.com.vn/app/webroot/uploads/files/80395660803.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109080130347299.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/37953516301.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161358cf91d55f---89104667676.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c98c189f3---24920820083.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/97217959823.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/kurixapadutedoraxabis.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/sefamarigimagaw.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/35496191873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sdk+emulator+downloadPDF 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_off0000db11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB11 10500 bytes
SHA-256: bc5254d68dfb8d10ea98fc95c72f1c51a9d998a808360b1bbc12e92ab1388e1b
font_01_sfnt_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B23 17520 bytes
SHA-256: 95960765963e76e2bbe2055622ea3176e40d0261223036eac2af85c1dc940dbb