Malicious PDF — malware analysis report

Static analysis result for SHA-256 765e25c86e4c6aeb…

MALICIOUS

PDF

69.3 KB Created: 2020-12-31 02:09:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 63f366871aff39b0ad30a5403f1d4ba8 SHA-1: 8e992edb8192956c5356c2f6157102bcd7c35190 SHA-256: 765e25c86e4c6aeb0242f5d5402fed045e0c646114dfbb9073521d7ef9802ccc
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 one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to direct users to harmful external resources.

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
  • 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://cctraff.ru/123?utm_term=what+area+code+is+720 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4495855/normal_5fe74b9dd002c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378606/normal_5f9be85f13868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371800/normal_5f9858d437e37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_5fdc606fbb118.pdfIn PDF document text
    • https://gasaromub.weebly.com/uploads/1/3/0/7/130776100/tenedojon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_5f8f90a54044c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bupijila/jingle_bells_hard_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e84e66cf-664a-4054-a463-1d578cff258b/94019426522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd3494e9-5dcf-4572-85ff-a6c5013d8588/xutajenamonafirajure.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/study_guide_for_the_giver.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/62482122733.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD079 5360 bytes
SHA-256: 4833856559b322e372563dd6932075247cc1f07a86a4c68d74662c7c5b8e8506
font_01_sfnt_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 11464 bytes
SHA-256: 79d9c9ddcfe65a943e6ad4713064071c72d6f9bda79539cf40fe827b5d5072b1

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