Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e6c1ac6b2031d5…

MALICIOUS

PDF

79.3 KB Created: 2020-11-16 12:39:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6c3c3b819e1ef8c068f867cf9afcf129 SHA-1: ddd701735d60cbe70b66824b2aeace049a90e717 SHA-256: 45e6c1ac6b2031d589333cfff1f88bf47029b1e2a7a7d79ad5bc85f9dcc50c96
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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/strik?utm_term=beginning+piano+books+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_5fa6e8e9c55c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5fa6475e7d91c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_5f88b8465c820.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500910/normal_5fb2546b31495.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/jukonodinabekip_gibupobi_debagogavu_bewozuvawalalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_5f91172350a1d.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/46426e27-c4a1-4dbb-9524-4e8ad9ebff39/63116671901.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/kamyab_jawan_program_loan_form_apply.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d80f838e-f2b8-4ebe-84ae-ef6dfb58fc3e/dotonutonelabomapinej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b2433a4-449a-4f02-a71e-bf0ce338ec66/jixolezigimoradimas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ec177b6-aa80-4743-b127-b364da5418c1/3260988269.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 2968 bytes
SHA-256: 282f83d0d60058b38b336e634da764e773fa7d01c86c0f43c0161739672667ca
font_01_sfnt_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 5040 bytes
SHA-256: 648e4e3d666fc09ef0fa1927137b284ccbfe846a396b8e332e3e7c012e9200d3
font_02_sfnt_off0000fff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF0 9876 bytes
SHA-256: f793996e477fe422f230e2045e52b7b7bb62c3ff175345da5352b5f1893349a1
font_03_sfnt_off000121de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DE 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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