Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5ecd75534312ba…

MALICIOUS

PDF

86.3 KB Created: 2021-05-27 22:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4e665f5b60f6f2dbe8472909951fc66f SHA-1: 22d0e6168f492f43b43d05219f5bbe154607d556 SHA-256: 3b5ecd75534312ba565a72d424726b0513bb8088f176143357d7cd024a27b7ee
204 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious sites. The primary URL identified, 'https://baarspo.ru/123?utm_term=music+maker+edm+edition++free', is presented as a download lure. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/123?utm_term=music+maker+edm+edition++free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485569/normal_600293afdfbb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471688/normal_6052c333a7298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470696/normal_60221d906eca3.pdfIn PDF document text
    • https://dexasarejujevi.weebly.com/uploads/1/3/1/4/131454537/5252813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_6011af25128a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_6032c32377a1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380528/normal_5ffd702955e15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390055/normal_60465db60733f.pdfIn PDF document text
    • https://jewumuseporefi.weebly.com/uploads/1/3/4/5/134599703/39446.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/1deea683-1b31-4ecd-85d3-ae0102f2a256/thai_jashe_full_movie_download_1080p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1094401a-17a2-44ad-9201-7aa6332df71f/project_management_software_for_small_business.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4c72d08-cc8d-49e8-a930-a3552fe49ba1/xozefilosogaliveb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/284f14a9-6adf-4e93-8fa4-d3f8be9074d1/what_is_the_importance_of_flowchart_in_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74105d87-914f-4216-b30e-20e4944c9ff2/xiwoxoxeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b65418a3-1fce-438d-b8f5-1c6a1dad2246/precalculus_sequences_and_series_test_review_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f53d8ef-cf05-4aee-a5fd-49f74dfe3813/xuginizugesuvafure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90787a70-3f4f-43d2-8cf1-ba6a877d8e03/sorix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06bda57a-c9ac-4205-bde6-cb36e2548e4a/nawirupevafovivesofaboze.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_off0001068f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068F 5084 bytes
SHA-256: 7fdeb4a760aaa3e219e8bc2217282484717934e8a0f34ff56a92795f8034366f
font_01_sfnt_off000117bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BF 11228 bytes
SHA-256: b962cb43956b1bffee0d7be8a39765f0e74f6dbe08b92cb8374be7acbfd9925a
font_02_sfnt_off00013e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E45 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333