Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf67f48f2d504dd…

MALICIOUS

PDF

70.4 KB Created: 2020-12-05 13:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 30ec205ef1a705c262f8bf5b7d17f848 SHA-1: d28a1db7a7c9e6ababa1c18bbac4750256852927 SHA-256: 4cf67f48f2d504dd0c6c97fac9909078fb08d3cc1f8292b950ac1ecf6aed9121
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 0.9997

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://traffking.ru/aws?utm_term=simple+and+clean+piano+sheet+music+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485718/normal_5fbf668284550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393632/normal_5fa60e4577ee7.pdfIn PDF document text
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/9001135.pdfIn PDF document text
    • https://dekobela.weebly.com/uploads/1/3/4/3/134332871/7ac81aca38be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464068/normal_5fa3377eb5643.pdfIn PDF document text
    • https://fopozawiluni.weebly.com/uploads/1/3/4/3/134383369/463fe0fbe.pdfIn PDF document text
    • https://wavuvavezexa.weebly.com/uploads/1/3/0/7/130775629/tizuma_xelix_musotejo_tiwide.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/5a8b96e5-3113-4f12-8598-b8fe18901ea0/rdr2_can_you_save_lenny.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2f3e1bf71053ccb1d777a/t/5fcad505a51c5a14019cc1bb/1607128325708/brown_leather_sofa_design_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/12979945889.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2af36df132613bbc92a03/t/5fcad0399cf56e0e8b03ccc5/1607127097595/eric_church_songs_new_album.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a8d1e1a-cbc4-49d8-96db-b3f5035ceec9/xasosunamaranogufujez.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_off0000c8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D4 5284 bytes
SHA-256: 4fdca0748e9c32f09952e83867356971a55d185f1931389c2e2178c2c4ab3d14
font_01_sfnt_off0000da91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA91 10528 bytes
SHA-256: 11e132903895f7c30b7cf72a8b0cdf9efb55889b9327f3efb4a7d2698ab7907e
font_02_sfnt_off0000fe6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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