Malicious PDF — malware analysis report

Static analysis result for SHA-256 01684c16da4ac5aa…

MALICIOUS

PDF

78.0 KB Created: 2021-09-14 04:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: adacf812ad1093084975a9d6cc63e4d9 SHA-1: 1a2574d8c760f0442206308d56e6c7d52bea8446 SHA-256: 01684c16da4ac5aa5d354fbd02618e7f960e5710075ac64e512849e0a71fc6fd
134 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious PDF files. While no scripts were directly extracted, the nature of the link farm suggests an attempt to redirect users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://scuderieverdina.it/scuderia/userfiles/file/88261492712.pdf In PDF document text
    • https://nstyapi.com/resimler/files/losujuxuterurasolane.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132193571d5d---27545474811.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/nuboxifer.pdfIn PDF document text
    • https://panoramabyty.cz/content/11224274433.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/radumopideviwajolixixize.pdfIn PDF document text
    • https://bliznacite.com/files/dakoragoworupegixidonij.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/16814821452.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/puxexezik.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/83966352476.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/sasamotilonogexewotuv.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/luxevewefo.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/vasamaf.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/mokijo.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/zolamubofidefuzunuba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec3decdae9---dugipujo.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/93030550290.pdfIn PDF document text
    • https://theipbuzz.com/images/file/63628770111.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/laxevaferafaramigumetu.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/barebosogixiki.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/10807749429.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/vofepimem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+driver+not+installedPDF 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_off0000cd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD86 10288 bytes
SHA-256: 91cb5e3c1bff3522bf29f2f5e60b8999a979471a1faf3633d58048ffe2879184
font_01_sfnt_off0000e4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D0 17600 bytes
SHA-256: cf57b6332803c6c45c3e7831071982dc4f8ee080d562031d37658df3b0c82b3d
font_02_sfnt_off00011223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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