Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9971d8539b2a2d…

MALICIOUS

PDF

89.3 KB Created: 2021-09-21 02:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b88f2cfeb437acce8c5cae1a3f92b479 SHA-1: 7cb0440fca3c3e29b23ae1027e7cd2ddbd8ef3e5 SHA-256: bf9971d8539b2a2d991e2de3f34438cf3074568928c8ec2edc8b4c7323b4b0c6
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely leading to a phishing page or a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://halkapsikoloji.com/userfiles/file/sefodumepawoli.pdf In PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/sogimegisirusegisuperidu.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/lojifatifimovodepo.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/kemujajetemo.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/tunipovebel.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/rapuzeviwixanatupifijewub.pdfIn PDF document text
    • http://4yoga.by/pics/files/komefofebudas.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/movofosominerepo.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/kuboxikopowaradiwupaneka.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/4279754083.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210909151743.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/vitiwov.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/83241134043.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/bamogufor.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/sirireroget.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/midesizutusujesupi.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/68226907812.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/lomapewonagovuvudusimaf.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/15649947782.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d97d9a9b5---77316192809.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306e3575e52---lemogeperulin.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/53111168944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=use+react+native+in+android+studioPDF 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_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 10488 bytes
SHA-256: 1b6b72703bcc24cf531fd1fa0aee5030c486c71127eaf25577547f97a976a019
font_01_sfnt_off00010d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12547 18876 bytes
SHA-256: 0889c0803a0c4442f8736205c3d04bed6a93983bb5ca4ecc73459d07b7868fd9