Malicious PDF — malware analysis report

Static analysis result for SHA-256 b261e295665fcdb9…

MALICIOUS

PDF

77.6 KB Created: 2021-03-21 06:19:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f4016270fada6ed0a88836507634000d SHA-1: 294c6b164ae492a6a46ed1dd337fc270f40fa853 SHA-256: b261e295665fcdb93855eea698c132147cba473c58576929dd07188ee90a3727
134 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/123?utm_term=bubble+letter+fonts+free PDF link annotation
    • https://cdn.sqhk.co/vinogusi/zKgehiG/best_food_delivery_deals_right_now.pdfIn PDF document text
    • http://wijofotezopadik.medianewsonline.com/36525743261.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/jed8Qib/photo_video_collage_app_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/nomevagume/Khgdrgi/draw_rider_plus_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/c0jajbU/break_time_n_stadium_columbia_mo.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/dfTTKhj/create_your_own_unicorn_avatar.pdfIn PDF document text
    • https://cdn.sqhk.co/xipuzotekela/djfibHA/2359220440.pdfIn PDF document text
    • http://leledup.mypressonline.com/is_wendys_breakfast_sausage_pork_or_beef.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/4c7TjjY/liwisi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/501638ab-ae2d-4771-88da-cc66ada4029a/52985417051.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/instagram_direct_message_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d76c699-a2f0-4216-a9e6-409e4b7e087c/jatefuvijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b942c0d0-81a1-4600-a3c0-2db41606f8e8/best_stories_to_read_to_7_year_olds.pdfIn PDF document text
    • http://samupuvigerolo.rf.gd/congruent_shapes_worksheets_grade_7.pdfIn PDF document text
    • http://kogavajel.epizy.com/cause_and_effect_worksheet_grade_7.pdfIn PDF document text
    • http://bibobega.epizy.com/cf_auto_root_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/risk_assessment_document_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26bc37b5-414c-4be6-ac80-7f7daa05b59b/gamam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d7b36fa-2562-43d5-a1c0-6baae1f5b72f/82600931353.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_off0000f3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A0 4740 bytes
SHA-256: 34479c21eeb00bdf39121d23b0acf212445e26ed4e9af2c1a320e5c1accb8aba
font_01_sfnt_off000103ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 11172 bytes
SHA-256: cd6172fee915c51c8ada3ab270876b6e201121f410664bc40c91fcd15ffa7137

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