Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6c70205b171c77…

MALICIOUS

PDF

78.8 KB Created: 2021-06-14 04:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c7b1788f5fde91841c3f5782ff27b3aa SHA-1: d346673ce460abb10bde88c9fe684a9b9d8c8f9c SHA-256: 3f6c70205b171c771a22045c6d0e87410c464e8f0d7f20f7ccee32f2443e88cd
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable hosting sites, identified as a link farm designed to redirect users. The embedded URL and the heuristic firings strongly suggest a phishing or malware distribution attempt, likely masquerading as a software download. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent.

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://wastran.ru/pbw?utm_term=photo+video+maker+app+download+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392442/normal_60c192b4bf049.pdfIn PDF document text
    • https://vulemozebo.weebly.com/uploads/1/3/4/6/134693025/55b99d2678e2a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4411245/normal_60afe9b478bb9.pdfIn PDF document text
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/virujinemosuju-sigavo-zojevamema-tazegipebufo.pdfIn PDF document text
    • https://kumupesefutevun.weebly.com/uploads/1/3/4/4/134463509/6355736.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4366042/normal_60b4a1f1b1794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418574/normal_6024fee0db1b7.pdfIn PDF document text
    • https://tigasedoxopafu.weebly.com/uploads/1/3/4/7/134707490/9811522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_60c2323cf3948.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496571/normal_5ff86f08a1ac3.pdfIn PDF document text
    • https://filududo.weebly.com/uploads/1/3/5/3/135390237/478d771eb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446789/normal_5fce0d97c712d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479222/normal_6023dc32a8e72.pdfIn PDF document text
    • https://kifikutomile.weebly.com/uploads/1/3/0/7/130776046/wazatakejokolo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463565/normal_5fd817e2e8b91.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/4a070e7e-ff80-4cfb-b479-0e349323801f/23811902889.pdfIn PDF document text
    • http://doruneje.pbworks.com/f/53381885268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ae04e6d-a5f9-41b4-9ad3-5e30e1be59fa/st_croix_hastings_pellet_stove_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d2f24c3-4c0e-4a9b-9850-ca8ac95af369/makugudetagilowuwoxi.pdfIn PDF document text
    • http://botinuba.pbworks.com/w/file/fetch/144570591/to_kill_a_mockingbird_chapter_1_questions_and_answers_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbab6cb2-2f28-4937-bde4-93ee2865801f/sokerusaninuxadetovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30d91809-1f35-458d-8035-4b8e3e344db3/simple_past_tense_exercises_multiple_choice_with_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 5240 bytes
SHA-256: cbca8b498ddbd229435cab74fe3bf8bc2c0d3fef774548dcc2ff55305066dcd2
font_01_sfnt_off00010835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10835 11032 bytes
SHA-256: 8520165840d778ed096efdf0406ef44a2d086a18d205b1229baa65028c7a7de9

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