Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a07f8cc2021fde…

MALICIOUS

PDF

106.7 KB Created: 2021-03-24 17:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: eaaa5b74a473e5f1d33074925d538f62 SHA-1: 57dd17d836025894ed4b950310e9a9bb06436465 SHA-256: 50a07f8cc2021fde8787eaf075b0bc2ba081ae4a06159ae080c6de1aa6e42037
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://resalured.ru/award?keyword=edward+said+orientalism+introduction+summary+pdf PDF link annotation
    • https://zipixaxunisegon.weebly.com/uploads/1/3/4/6/134625234/vobeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390097/normal_605821b721c48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422136/normal_5fcedecaea0f0.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/bigaxasi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385617/normal_60477c4235fbc.pdfIn PDF document text
    • https://tunuwadubozowe.weebly.com/uploads/1/3/4/3/134363043/45624afacad.pdfIn PDF document text
    • http://milano-moda.space/pcb_design_proteusi1f2f.pdfIn PDF document text
    • http://cancandance.org/giant_eagle_in_heath_ohiojzbue.pdfIn PDF document text
    • http://phrensy.co/weight_watchers_scales_manual_w2bwqerx.pdfIn PDF document text
    • http://kushtanash.ru/gegopepitizumusyp8ww.pdfIn PDF document text
    • https://gekanabedo.weebly.com/uploads/1/3/4/3/134318260/toferopo.pdfIn PDF document text
    • http://profapp.pro/diy_adirondack_chair_templatei5b1s.pdfIn PDF document text
    • http://zavolofa.mygamesonline.org/finolis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lusabifef/61550797009.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/discord_formatting_embed.pdfIn PDF document text
    • http://zovibeviniga.myartsonline.com/rozofut.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/4882572718.pdfIn PDF document text
    • http://likewiwojuxus.atwebpages.com/simbologia_de_diagrama_de_flujo_y_su_significado.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/the_further_adventures_of_sherlock_holmes_books_list.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16453 5452 bytes
SHA-256: 3d1c54cc9057154e4013547a2895aa1b9dbb522418c2551a57169b5f3caa2e73
font_01_sfnt_off000176e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176E8 11856 bytes
SHA-256: 073352be19c6db74af7f3c13e34f4dc3a4c09a25643fc431e455ad0267157922