Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4eae5d8aaec288…

MALICIOUS

PDF

70.3 KB Created: 2021-01-04 20:47:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 30fb80bf934d2a268d1e7557038b2026 SHA-1: b6d865458ad37921e7476efad3b899123555848a SHA-256: ef4eae5d8aaec2887644193002f04b978a83e13ddf94f48b49b1640207dcc4e3
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the presence of malicious links is sufficient evidence of an attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=sim+card+reader In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_5f9fd428c7b93.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabure/hiDgcii/molarowimut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481671/normal_5fad67bcc8eda.pdfIn PDF document text
    • https://lepuxodotedob.weebly.com/uploads/1/3/4/5/134507089/saromuro.pdfIn PDF document text
    • https://cdn.sqhk.co/digiwejasipu/njcjihj/blood_pressure_medication_good_for_pregnancy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ff0e480-8c09-4f64-ae96-3e7544df1822/broadcasting_cable_the_internet_and_beyond_7th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21dd78a8-3b74-4f8b-9809-a14cfa6c8762/kivotidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/210d8c03-b826-4fe4-9c28-ee4fdcd3c088/wewegogitiwofataxek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2582e4f2-915f-4559-9385-a930e14b6029/plaque_free_score_percentage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3771bb1-f273-470e-ad1c-e0c229d616fd/35805368184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42fccfb5-9821-4d86-aa4d-def85c9cb3b4/19465606684.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_off0000c476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC476 5448 bytes
SHA-256: aaa80a9f61990e838ee1cc64355a9dbf1bb79156548aed99d4c105c116449f17
font_01_sfnt_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 4976 bytes
SHA-256: 2b2a9d52396715577440ef64815c7dea6ddd5141d8f6bcbcffb6e1d5ead906ca
font_02_sfnt_off0000e835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 10160 bytes
SHA-256: 93db7c475371d31bc257c3b59342494c23719b217f318cdd8cec0f7a158c407f

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