Malicious PDF — malware analysis report

Static analysis result for SHA-256 674cf6883c9de925…

MALICIOUS

PDF

70.5 KB Created: 2020-11-20 08:02:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f738b8e860d9d31830e5f42eb947de67 SHA-1: 92d59412a14d36e95de45fe83f4d6f920a796181 SHA-256: 674cf6883c9de92570a1016a263bf4b0fbcdb54dc5bf623c613792f8f15ffb23
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-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://gettraff.ru/aws?utm_term=kathi+movie+songs+telugu+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380086/normal_5f8cb678dd080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456128/normal_5fa0efdf437d0.pdfIn PDF document text
    • https://fenivubad.weebly.com/uploads/1/3/4/4/134482284/0c7aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446925/normal_5fa87250bb73a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368486/normal_5f9413cbac6ba.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/7a2f6a42-fa54-41e9-a8f9-ee24694c00ee/netsis_muhasebe_program_indir_gezginler.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/ics_200_formal_communications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7acd3d53-3e51-421d-bd6f-9776209f64fe/7553503331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a925946a-ecf4-435b-8161-de335fde4e83/automatic_call_recorder_pro_5.58_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65cb5f4e-74b7-49eb-8898-4e78d0b3cd30/43517966583.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/16963563894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64117243-387e-4fd9-8b85-fdd6e4f5da92/75697732620.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_off0000c8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A9 5092 bytes
SHA-256: 7a0dba7532bdcf3fd79770909a02459fefb088d049f5df0b5b83f4f67620e405
font_01_sfnt_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 11052 bytes
SHA-256: 9c5f0c0bf781c3f5c3b5cbd8861f23ca0b2802bdf73a4d4836d004f7a698ff22
font_02_sfnt_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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