Malicious PDF — malware analysis report

Static analysis result for SHA-256 39018f8cc8bf7dde…

MALICIOUS

PDF

76.1 KB Created: 2021-03-21 06:29:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: df8a9427db0967e912d293e2a4a662b8 SHA-1: 10f4b65401286fa03e825cf780ce3d5954635be1 SHA-256: 39018f8cc8bf7ddec5cb39bda835cb617a99653c9aa362ab26536bcafb1f5703
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://lozipotod.ru/award?keyword=dahua+cctv+catalogue+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457620/normal_6054fdfbf2f0e.pdfIn PDF document text
    • http://jitokinut.iblogger.org/10746544983.pdfIn PDF document text
    • https://mujesazuf.weebly.com/uploads/1/3/2/3/132302915/nizim-kebamozurenosok-repif.pdfIn PDF document text
    • http://kizamipof.iblogger.org/leigh_rtj400_dovetail_jig_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375504/normal_6025b91e42033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446035/normal_6020459473eb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_60184b6e180f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413975/normal_60437f2bd48ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417817/normal_60373db4ee774.pdfIn PDF document text
    • https://tatasabazenaxaj.weebly.com/uploads/1/3/2/6/132695883/3231eff92f.pdfIn PDF document text
    • http://ribefiraxoto.iblogger.org/26806687429.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/bc87ec61-20d6-49a2-8f6a-bc1e8bacab7b/starcraft_2_legacy_of_the_void_mission_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/606df704-fb75-4ec4-8944-52d041cad25f/how_to_connect_playstation_gold_headset.pdfIn PDF document text
    • http://tazolupiviroliz.epizy.com/saeco_coffee_machine_for_sale.pdfIn PDF document text
    • http://lefabeku.epizy.com/selenium_firefox_driver_for_mac.pdfIn PDF document text
    • http://visegob.epizy.com/awaken_the_giant_within_tony_robbins_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/855c18d7-c41a-40e4-82f1-d5852f94262e/how_to_install_fujitsu_scansnap_s1300i.pdfIn PDF document text
    • http://ribaxexumipo.rf.gd/check_json_format_in_javascript.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_off0000e145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE145 4932 bytes
SHA-256: 511f190ad5de5fb898da19ca5e5217556a93dfbcdc6cbf00bdbdb347b37ddf74
font_01_sfnt_off0000f230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 10308 bytes
SHA-256: 84806af4f7c13de9ed36297d7282c68d8c316a9b4ff4df15a9a6656f1cd55be2
font_02_sfnt_off0001158c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158C 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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