Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd62d7c342a5bb1…

MALICIOUS

PDF

78.6 KB Created: 2021-03-19 17:20:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 48d9ee64f1e347b5bdc95f09054c1fbf SHA-1: cf556b654c82cad4bf40ee53e6f0fc24559ae8f6 SHA-256: 9fd62d7c342a5bb1de930300cfa096fc9615ccd2d02e88c03fbded5cce3b25c1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically linked to 'physical education exam questions and answers' on a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and a link farm heuristic suggests the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://jottigo.ru/wix?keyword=physical+education+exam+questions+and+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477913/normal_5fdab89d788cf.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/how_do_you_keep_squirrels_away_from_your_bird_feeder.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426966/normal_603900f22d8c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_6011de8d1f9ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467038/normal_6048e6cb0f812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485157/normal_6052498f87f55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xodenumaverap.epizy.com/sojemudafotexusosetexa.pdfIn PDF document text
    • http://nupadiruto.rf.gd/dd_3.5_monsters_by_type.pdfIn PDF document text
    • http://kuwijiti.myartsonline.com/7046265007.pdfIn PDF document text
    • http://rowoniwetob.atwebpages.com/because_you_loved_me_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/out_of_office_template_for_terminated_employee.pdfIn PDF document text
    • http://tigagatu.atwebpages.com/kekofofedibumizejofixi.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/25569240641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26083ac8-7eed-4ff3-b810-5e5d3feef71d/amos_and_boris_story_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/bizhub_c227_manual.pdfIn PDF document text
    • http://sawokinajiralar.rf.gd/eicr_report_codes.pdfIn PDF document text
    • http://vopepogam.rf.gd/my_cloud_home_4tb_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d942485d-380d-42a5-a03f-29cb464d39f7/pimawifugezalosirez.pdfIn PDF document text
    • http://jeraferup.epizy.com/dufugogebivalamuruboz.pdfIn PDF document text
    • http://vodomuvukowoz.epizy.com/top_builder_html_template.pdfIn PDF document text
    • http://katetagozu.epizy.com/57043695173.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/bolepamunubeni.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_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 5568 bytes
SHA-256: cc6d1128156eeb441271279fdf5c97e82d21132bd56d9df8929a3ede4e97c966
font_01_sfnt_off00010654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 11424 bytes
SHA-256: fd234521daa6a1e18fb5b5285f1729fbe044d4a7b0871152e545815e27495ce4

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