Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc468d4ccf8c38ef…

MALICIOUS

PDF

66.9 KB Created: 2021-03-31 23:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6dde05a87cbc5cd2a4b44de9262d40fb SHA-1: 8e8819a789a2c656a30cd8b8d2033c79d770964e SHA-256: dc468d4ccf8c38ef47e78296b4e971527dc5e191dc4c1c35e5602ea4049a59ff
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://dugedepap.ru/wix?keyword=biddeford+school+department+facebook PDF link annotation
    • http://rostov-mobile-doctor.ru/58927555358do6zf.pdfIn PDF document text
    • https://fagugirawax.weebly.com/uploads/1/3/4/3/134388021/wasijobusijubod_befizane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479462/normal_5fdbfe0dd16d3.pdfIn PDF document text
    • http://gufutaca3.xyz/whats_another_word_for_constitutional_conventionuqete.pdfIn PDF document text
    • http://karnaval.host/cerebral_sinus_thrombosis_ct_scanbjyjc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454421/normal_5fc969ffece9b.pdfIn PDF document text
    • http://instasale.company/63063784094qdj15.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/69819124229.pdfIn PDF document text
    • http://soferijivav.getenjoyment.net/likubivebovamoben.pdfIn PDF document text
    • https://pekijazezob.weebly.com/uploads/1/3/1/4/131407278/2582862.pdfIn PDF document text
    • http://konsalting.info/leadership_behavior_definitiontg6i4.pdfIn PDF document text
    • https://xekafifem.weebly.com/uploads/1/3/4/6/134669887/6917953.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/wanasuvedigo/birotezapedafem.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/free_app_whatsapp_plus.pdfIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_71fd37d6e81a4c3c8bc7f47dfb5ecbb4.pdf?index=trueIn PDF document text
    • https://5405d108-7f1e-482b-a10c-e06f62b7505d.filesusr.com/ugd/d941b1_cbbacf162ece47418deb9191f5097dbb.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_ece071a14f2246a5b4abce02037057ef.pdf?index=trueIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_31bfd57da8c0484e84c68b5ca192624d.pdf?index=trueIn 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_off0000c6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C1 5648 bytes
SHA-256: c755ee583b417767c644a537ac7bc71696fba8e61ab44f69ada429c12ce50a50
font_01_sfnt_off0000d9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D0 11192 bytes
SHA-256: 4aaa4a10b101531d9e397a7f95a6188f64e10741db0307b5e73936d8c26bb022

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