Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bef650aa582e52a…

MALICIOUS

PDF

73.8 KB Created: 2021-02-26 08:28:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ad601b9486ef8bca4c8f8006e73c73a1 SHA-1: 896d402c4cb1bd3db864b4e183fd0eabc6597903 SHA-256: 3bef650aa582e52ab300299ee1a8e080f81adc9499144d40c556525901f76f37
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=kelso%2527s+choices+lessons PDF link annotation
    • http://bellissimo.online/26429754658uwcut.pdfIn PDF document text
    • http://naturfresh.fun/91446819385af9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459055/normal_6023952852eaa.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/vgdggih/53323488455.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401691/normal_600631da7a783.pdfIn PDF document text
    • http://naturwow.space/home_depot_fact_sheeta0iwh.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/dogPQia/34024007979.pdfIn PDF document text
    • http://instasale.company/53365788763x71ua.pdfIn PDF document text
    • http://dressnbuy.com/another_brick_in_the_wall_pt_1_tabs9tcr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465263/normal_6021672623ef3.pdfIn PDF document text
    • http://instup.xyz/training_manual_templates_free_downloado79v5.pdfIn PDF document text
    • http://znatural.space/dumb_ways_jr_boffo_s_breakfast_free_apkoe9nt.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/ijjgyhf/36109201332.pdfIn PDF document text
    • http://swast-group.website/independent_commission_against_corruption_act_19882ed8i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kubafezin/guardian_quick_crossword_15396_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA97 4292 bytes
SHA-256: fc1dcca4f304adbaf808ef044a162c1e2f51b9e3b136af83144803b1867600c4
font_01_sfnt_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 10316 bytes
SHA-256: aae741ebb8d64b57a4a8fd998ec6b378f2832895f4dd60d7807fb5171c056e6d
font_02_sfnt_off00010c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C34 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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