Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1531a3d69a3bd1…

MALICIOUS

PDF

67.6 KB Created: 2020-11-10 16:27:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 808e52ef5bb37c88005ea93ff18c7599 SHA-1: db56a4fed43aaae5d5701580c7921e6f7a655f6a SHA-256: 1a1531a3d69a3bd176c2326cf75eae79fa45d39820f120ea5e4a2136f01fcb02
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 0.9997

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://cctraff.ru/123?keyword=giancoli+answers+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389355/normal_5f9bec1cbcd8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f9e84c4b91dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368486/normal_5f8df2f1ec84f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459325/normal_5fa5660a2b253.pdfIn PDF document text
    • https://fevixivosetakub.weebly.com/uploads/1/3/2/6/132681861/bijalitowis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470839/normal_5fa4884093506.pdfIn PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/vutaduge-kerobubojibi-gilapa-kotini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443814/normal_5fa288bb417a2.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://s3.amazonaws.com/jofunoje/74200572776.pdfIn PDF document text
    • https://s3.amazonaws.com/lopazura/critique_of_political_economy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b22b76b8-cb90-4b77-ae5d-df2d27083e29/91678751255.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/pdf_editor_extract_pages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67975c9e-22b8-4790-9264-1c132fd8511d/ziwonixuri.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_off0000bd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2E 4980 bytes
SHA-256: 3b770fcf1a8fec0f3a769e1361f56d8e05ddb7ed06656db41f571fbd3f7989d0
font_01_sfnt_off0000ce33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE33 11104 bytes
SHA-256: da3450001d566d5d4236588d3081fa976ad66af60fec772c72a3eaff4e4d3143
font_02_sfnt_off0000f392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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