Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab09c8d590bd41c2…

MALICIOUS

PDF

75.1 KB Created: 2021-06-09 19:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c28738be51248e2880c2de8e489f0eb9 SHA-1: 696b766ffaab888a859cc383fc360573b47a1d04 SHA-256: ab09c8d590bd41c2b9ea17cfd1e4339bbb78f848d3bf133456cf1dd86ee686e2
156 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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The primary URL, https://crewmak.ru/pbw?utm_term=amazing+spider+man+daily+comic, is likely used to redirect users to malicious content. No scripts were extracted, but the PDF structure itself is indicative of a phishing or spamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://crewmak.ru/pbw?utm_term=amazing+spider+man+daily+comic PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366331/normal_605e025308cb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476122/normal_604161d48a9d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475570/normal_5ff2b16342069.pdfIn PDF document text
    • https://torimavilok.weebly.com/uploads/1/3/5/9/135984964/janijapifigajax-pirazunes-binadibazuwibi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_60baa31088940.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372371/normal_60068230f3abe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367013/normal_5fe3e598ece82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470540/normal_6049bbce87120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374373/normal_6036c5c96ab51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444371/normal_604d66d191da2.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4387243/normal_60b3e7d63ecfd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368229/normal_5ffa298267c9d.pdfIn PDF document text
    • https://remenogabeta.weebly.com/uploads/1/3/4/0/134012297/1003503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368762/normal_5fe9b7f351131.pdfIn PDF document text
    • https://gigawixirebasig.weebly.com/uploads/1/3/1/8/131857482/640a456.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/801e76ca-4f39-4c7b-b09d-2ec5ec5a0d91/55988178394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5559e0c9-505e-4ca7-8916-1c0a32c6793c/dajudaxofonimox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e7e1b7f-fbfa-409f-8108-cc7cb9fff568/90024159431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36f9e67a-8285-4707-87c2-f731186c1db4/73152062547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cebbc5eb-3cdd-4c50-80a2-de0afcbb330f/fupove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ade15038-c1f9-488f-9700-f9e9176ea8e4/inorganic_chemistry_topics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/525ff5bc-7f9a-447e-b7eb-32b0be374bad/vanderbilt_teacher_follow_up.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_off0000e760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE760 5532 bytes
SHA-256: 53d4a53415fd99d6774ed576ce580a67360201cb64f7bb44fefd35630c9cfe86
font_01_sfnt_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 10800 bytes
SHA-256: 4df233f497fe45dd343b4a9f0c6fbaf58a6bd872ecafffbe4b59de47078e102e

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