Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96afb5dd24e1799…

MALICIOUS

PDF

67.8 KB Created: 2021-01-04 23:06:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a689c0553b2e413a4a584debee382ba3 SHA-1: 278aa797bc6636c7f15463dc4e4e6e65b1f31900 SHA-256: a96afb5dd24e1799565e194fc8f77caae4d525f204a7115345c5c8da0d8b5e19
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, with at least one identified as a redirector to malicious infrastructure. The presence of numerous links suggests an attempt to direct users to phishing sites or download further malware. No scripts were extracted from this sample.

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?utm_term=ffoo+tier+list In PDF document text
    • https://nupejaxisolerez.weebly.com/uploads/1/3/4/3/134348845/1959859.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/468d3abe39f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479938/normal_5fc75d3970cb6.pdfIn PDF document text
    • https://nufosizusom.weebly.com/uploads/1/3/4/6/134619592/202a4856722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453103/normal_5fa25f8b6177d.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/ad290cc5-400c-4d6f-ae76-031071ec5e42/japixixazigujunam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a8a5d1-0f13-4129-9301-f2261e28cd54/vipifuvopozul.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/phd_personal_statement_sample_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9374f0a-bbe0-407a-b124-c48ca70e1e60/68673274454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f1db83-e19f-4b12-b4b9-fc819ef005b9/60531003913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39b36be8-b2cf-473b-9ac1-d3054c2c4558/39256232421.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_off0000c278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC278 4188 bytes
SHA-256: 27b958641080d71a6b55f050cce0c276933698ea173f03e2d71865243d0bee67
font_01_sfnt_off0000d0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BC 10584 bytes
SHA-256: 0633dedcced38f77347d7add470226d57c25759bdde2a489e6101e0397e119b3
font_02_sfnt_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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