Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cfd3537a69d1678…

MALICIOUS

PDF

91.0 KB Created: 2021-03-17 01:59:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c876332f29be18f5033b794c4304d064 SHA-1: 39d34c7549bd1cb3a5584fdafb13fdf71eba4c06 SHA-256: 2cfd3537a69d1678b4f30f505158c5e8e9a2f1817adfcd84d25c0d7487ffca2f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous external URLs pointing to other PDF documents. One of the primary external URLs is https://xezojetit.ru/strik?utm_term=precision+sewing+machine+co, which is likely part of a phishing or SEO manipulation scheme. The presence of many external links suggests an attempt to distribute further malicious content or engage in SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/strik?utm_term=precision+sewing+machine+co PDF link annotation
    • https://cdn.sqhk.co/xivomojuf/ijjadSj/pc_bus_simulator_games_free.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/46644434316.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/triangle_congruence_test_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/sukurorezib/yijchhF/reclaimed_wood_platform_bed_diy.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/2kghajg/31649801845.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/OifjiCU/top_10_best_driving_simulator_games_for_android.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/sony_bravia_32_inch_tv_2009_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/vutabopi/iighjgd/75501574003.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/ifjggij/sokaduzisezoduxuwoboda.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/jgVVRKL/launchpad_macmillan_higher_ed.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://uploads.strikinglycdn.com/files/d55fe9af-b216-4353-a4cc-6e6b2811e30c/73717836096.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/home_designing_software_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7356cae1-6895-4088-9e2c-0b949233e564/46909538779.pdfIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_9698773c9ff54255afe8b26bd1d710ff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a3e7119-d259-4d38-9759-8e4acc6d4c58/45202873052.pdfIn PDF document text
    • https://8a05da06-75fd-4b4b-8779-f7668a2fa4a0.filesusr.com/ugd/da32d9_a0f955ef0e014362bfe15da7a26f3fee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a59fbf1-d167-4289-a9b7-9b144e65c4ac/bukatanazoxujez.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_f4818d9a85ce445193f2570eedcf2c54.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davubewu/2603700582.pdfIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_78f9db4fa286437e94fb9a3bcf46c205.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04a19a1b-6e90-4a3b-a8dd-c44f9a7a4c9c/what_a_man_should_be_quotes.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_off00011995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11995 4980 bytes
SHA-256: 92ff3af644f3eef269cf0cea1d9afcb204cb02773d9935c494685808753055c6
font_01_sfnt_off00012a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4C 11176 bytes
SHA-256: 2983b1b4f8b20361f86e86149c96a65900d8514b50103c18e09f7a5d90a0c61f
font_02_sfnt_off00015065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15065 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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