Malicious PDF — malware analysis report

Static analysis result for SHA-256 165c518389a3266f…

MALICIOUS

PDF

146.1 KB Created: 2021-03-25 02:38:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 63fc8ea33c5e63a89e6de2e709a16144 SHA-1: ded1714d9ca815f5d5b9c89c7a8dd552d68bb202 SHA-256: 165c518389a3266fa0e44dfd65f182b74654c2b7e6204ac977ecb717937069a2
186 Risk Score

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 0.9994

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://nipisod.ru/wix?keyword=hard+platformer+games+unblocked PDF link annotation
    • http://fomoregekamikat.mypressonline.com/autism_spectrum_rating_scales_asrs.pdfIn PDF document text
    • https://kuweperiti.weebly.com/uploads/1/3/4/9/134904821/1742993.pdfIn PDF document text
    • http://nosatines.mypressonline.com/sotabojosobilek.pdfIn PDF document text
    • https://teraxumafelenug.weebly.com/uploads/1/3/4/7/134747654/95abf372c70bb37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mikesivu.rf.gd/dixisobasog.pdfIn PDF document text
    • http://zigexejumex.epizy.com/33105868412.pdfIn PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_f8242658d01c4e3e8f5d2c87a6de76f5.pdf?index=trueIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_be0e94db7f6d4813aed7409081489892.pdf?index=trueIn PDF document text
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_63bb682ea5bc4819b5a18ac7617df687.pdf?index=trueIn PDF document text
    • http://surobufalinaxis.epizy.com/celestine_donkor_agbebolo_lyrics.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_6cf4a242218e4699802691b1d1c7b4d7.pdf?index=trueIn PDF document text
    • http://xotepugiz.rf.gd/rupitijewanasizobarikos.pdfIn PDF document text
    • http://wavagejofelodun.rf.gd/ajcc_cancer_staging_manual_7th_edition_breast.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_e5ddb06a98c9490c9031bcd4e5db5770.pdf?index=trueIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_18283918f9924b06b6fdfadfe2692680.pdf?index=trueIn PDF document text
    • http://lomiwolidosin.rf.gd/basic_language_skills.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_off0001ed37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED37 3372 bytes
SHA-256: 519d6ffd6621ba0380ee79f18010c47d16e685c59ba890fc3f4d6fdbaa99658a
font_01_sfnt_off0001f948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F948 5640 bytes
SHA-256: 7ea4d58aaa601b0e474a20fbd95a188feed0ab4b8d3c3d1e5e8e64898cb46040
font_02_sfnt_off00020c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C5F 15552 bytes
SHA-256: 1698103298ab5b4aca80164cbaa5038ac90e2b4441925bf51cd724ead0b7c5e5

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