Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac33501aee9bd9dc…

MALICIOUS

PDF

74.8 KB Created: 2020-11-25 16:44:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8fa26937fef988fe84e7428bd0529e5a SHA-1: bb0a3839057c8c518fe36dd3ec3e7dfdda672b8f SHA-256: ac33501aee9bd9dc557a479f272e40e77bf5c38478c0d4be14e9050dd9e783ea
156 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. 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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/strik?utm_term=japanese+traffic+signs+and+meanings PDF link annotation
    • https://bofezukidev.weebly.com/uploads/1/3/4/4/134464138/660779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372982/normal_5f91e8650e94c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/18bc0066-4ac1-41ea-9666-926ffca13692/74616412946.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/ca_course_details_after_12th_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/173ba21c-94c7-46c8-9f17-f2f20c5886df/womoruvoxupilup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea26ae81-f02c-4e77-ae4a-a707c12bc6e5/6941942054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37493723-e49b-4e43-baa4-a74169a4df69/kosovizozuzow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9e67bd6-9762-4f9d-95e9-9915f5239d18/runubaxovujovuro.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/voluntary_resignation_letter_from_employee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d96ee35d-36ac-4dbc-a7a8-c7cc55ad9280/jonajaxuwaxosoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4de8e90f-6b02-4805-8f07-614a4a4db378/dikugajotolidi.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/18984405094.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_off0000c862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC862 8104 bytes
SHA-256: b33822973b49e868883830383067944927745635a780c7cf7740f2a35eb47619
font_01_sfnt_off0000e365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE365 5432 bytes
SHA-256: 820edaa71c3aacc174259a203d4c2919cfa6cf3ade09002e2f01ed0fd4bb2845
font_02_sfnt_off0000f5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C8 12768 bytes
SHA-256: becc8183fa6c505c6f7569fc5a1de7ccfdca238182e526a06e3583578e8964af

Open this report in the interactive analyzer, or submit your own file for analysis.