Malicious PDF — malware analysis report

Static analysis result for SHA-256 8724f634d731aeb5…

MALICIOUS

PDF

69.3 KB Created: 2021-09-23 19:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 37c16b0fb30f9bda2bd6ea14531b0881 SHA-1: c2f6d0a2ccb52bb516376cc7334b509d19e02674 SHA-256: 8724f634d731aeb5ae856e4619c78411e179f796769a0fe7d123a4d855612b24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The presence of numerous embedded links, many pointing to potentially disposable domains, suggests a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://xpeedon.net/userfiles/file/20210914144535.pdf In PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/zugigexabatosiv.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/90598551945.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/basuwewewapubidajonevepug.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/filolevixarisasar.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/40220909580.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/6742982323.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/25057462137.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/33999159789.pdfIn PDF document text
    • http://balone.net/_upload/file///libalolebime.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d00d593f1---72235859807.pdfIn PDF document text
    • https://spacio.hk/attachment/file/mulunikawupusonupefi.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/3961891954.pdfIn PDF document text
    • http://boldogelet.hu/media/75765289209.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/gijijibalivof.pdfIn PDF document text
    • http://fedime.org/imagenes/zemodatodokaj.pdfIn PDF document text
    • https://conrays.ru/f/data/12477834676.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/1048056788.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec673cd8e---20070866483.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/gomajosokebum.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/raxadezojunur.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/tuzosuvogidagiwowujawu.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/sifikizonipujovi.pdfIn PDF document text
    • https://nexapos.com/upload/files/48320724022.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/77691810763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=wifi+hack+with+androidPDF 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_off0000b211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB211 15296 bytes
SHA-256: d6fef2a89826ac76d3ffca518e545624fbc734b259139450b9f9972aad87eb27
font_01_sfnt_off0000d874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD874 10396 bytes
SHA-256: 5c009db56a914cb9f1c2efaf5f387bccb55e43302ac07b5c91936ad45daf009f
font_02_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1