Malicious PDF — malware analysis report

Static analysis result for SHA-256 48870582d212bb3c…

MALICIOUS

PDF

86.1 KB Created: 2021-09-09 00:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f41b22885bee54795fed7338b6309f0 SHA-1: 716c23f4e3046b760aa58fc1f24edf08589003f9 SHA-256: 48870582d212bb3c2b895169a523ec72444eec39e8dc61e15d9b9780a140cee1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct domains, one of which is hosted on disposable infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613926317bd1d---97454654564.pdf In PDF document text
    • https://silky.ae/images/bulk_images/files/58069100236.pdfIn PDF document text
    • https://andana.us/files/files/fejosetexosagawobodid.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/jewaguxedelapuwure.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/lilavimazonepisexodapa.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/wumuw.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/31037555085.pdfIn PDF document text
    • https://cooperspick.com/files/52999153645.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/64135104343.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/wokodasalukasofijiga.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/59985380416.pdfIn PDF document text
    • http://bronia.org/userfiles/file/xataferal.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/tadudubo.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/19180756535.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/fabesatelu.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/kerisi.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/70073452656.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/14527300817.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/d663dcb8fab741bc10d7332e298da196/desawomadidifanitubipi.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/nogikekovejawesixo.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/26154850286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ps+video+editing+software+free+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_off0000ecf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF3 10680 bytes
SHA-256: e91d1d6b5f23b93a289dca5fdf57ae5a83e2fddb0b2c5f407d64a721b596f184
font_01_sfnt_off00010575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D87 17540 bytes
SHA-256: 37c79bb16ade3e805ac7dca05c782d83039a9cd01fa5de89e33960d231af0437

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