Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8114731b54360e…

MALICIOUS

PDF

116.3 KB Created: 2021-02-16 21:59:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 035327396c0167a8cf299763eedd3b12 SHA-1: 3f67c5bb5b0f8e197bad8cc20ffa054037d53c67 SHA-256: ca8114731b54360e7d66c141d33d2446f694d8e3f60cd97efc34e8bd9e5b5acf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://jottigo.ru/wix?keyword=julius+caesar+timeline PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380210/normal_602a74ac02f33.pdfIn PDF document text
    • http://sparzha.club/meet_me_in_istanbul_resumen4rp53.pdfIn PDF document text
    • http://lavka-karamel.ru/que_significa_bbva_bancomer_en_siglaswios3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426407/normal_5fe6a822994f2.pdfIn PDF document text
    • https://zoxujaratufopa.weebly.com/uploads/1/3/5/3/135399722/sadubowubufo.pdfIn PDF document text
    • https://cdn.sqhk.co/runenuti/hhjzPHB/7034804025.pdfIn PDF document text
    • https://cdn.sqhk.co/kukelagalefe/fif3hGc/16658459224.pdfIn PDF document text
    • https://pirulavedup.weebly.com/uploads/1/3/1/3/131379447/bijugipepoledad-zomofiwamu.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/48gg5ja/best_ninja_movies_on_amazon_prime.pdfIn PDF document text
    • http://znatural.space/99589296743s2qyw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382420/normal_5fe93a1a9e55e.pdfIn PDF document text
    • http://upgrade4me.com/36820546094s32vq.pdfIn PDF document text
    • https://sovejugi.weebly.com/uploads/1/3/4/6/134652237/d95fecc.pdfIn PDF document text
    • https://vekatofe.weebly.com/uploads/1/3/0/7/130775682/e52cdff.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/wetowuzuxit/simlock_check_android_kostenlos.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/9915368746.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/platform_9_3_4_shop_discount_code.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_off00019103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19103 4936 bytes
SHA-256: bba603802340cb322f2bdf07d0a0ef55f90056d6ee27e4db629ddc97e5c8061c
font_01_sfnt_off0001a1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1B1 10000 bytes
SHA-256: c17f12140f301303c369b905481d2de1479c550af993cc6d1298f91a7260a92a

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