Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13769ef443fd9b0…

MALICIOUS

PDF

76.3 KB Created: 2021-03-15 09:54:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4c8d0ec0a9bf1e287d80e1a5c37d6fca SHA-1: 2a3cd066f45bc7a680aa0a3f7c35e1e05e347ba4 SHA-256: a13769ef443fd9b0de26c4a6f6637719fe9ef6b55c99ab861f6036d0996ac6c5
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 0.9997

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://mezovuduw.ru/strik?utm_term=how+often+to+change+honda+lawn+mower+oil PDF link annotation
    • http://reduslimitaly-ufficiale.website/bunco_score_cards_free33d5u.pdfIn PDF document text
    • https://rodovijakul.weebly.com/uploads/1/3/2/7/132741348/kofunonawati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454419/normal_6033b51b3aaee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385612/normal_5fceaa36dd080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486772/normal_5ff352e6e2f15.pdfIn PDF document text
    • https://sotugipuzelaj.weebly.com/uploads/1/3/0/7/130738723/mazifezu.pdfIn PDF document text
    • http://sabazat.22web.org/washington_dc_hotels_near_newseum.pdfIn PDF document text
    • http://vipmanmarket.space/master_of_the_universe_movie_posterrg2g6.pdfIn PDF document text
    • http://kujakaveru.iblogger.org/free_crochet_baby_blanket_patterns_for_beginners_2019_youtube.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bilunijo.epizy.com/57810982569.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/87644541799.pdfIn PDF document text
    • http://sowawobajomo.rf.gd/87808031455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/436861d0-8b35-4a25-8e92-42013ab8a745/49376170292.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/inventory_excel_sheet_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbfa2d61-c08e-4560-93c2-d2afff8cea44/the_merry_adventures_of_robin_hood.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/nonikunukidigobaban.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/16170278776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/671c8f5c-1e99-4ca8-9afd-987c0add5a5f/79195381015.pdfIn PDF document text
    • http://pakafadudu.epizy.com/android_emulator_windows_10_mit_bluetooth.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/jowowiwijakoseti.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 5312 bytes
SHA-256: 1bcac503f56717770a44087c721fce6e1925f134975898b3d4a5d68bbb1ea4a2
font_01_sfnt_off0000ff74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF74 10760 bytes
SHA-256: 48a14690fe2dfb82f0a00580ebdcc427dcb34e20e2037b06025d7c16c897f0c2

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