Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8324e6fae9e64c5…

MALICIOUS

PDF

81.1 KB Created: 2021-04-04 21:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 56d469bf632254f8ad8c412d79d92395 SHA-1: 2da227e6eb4bd6d9def6cc314f2f9e16c84e56af SHA-256: f8324e6fae9e64c5e466eaf8135588b0fe8baffc0f892d3720e22f26a5160df3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, 'https://seumenha.ru/strik?utm_term=how+to+start+court+proceedings', indicates a potential lure related to legal proceedings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/strik?utm_term=how+to+start+court+proceedings PDF link annotation
    • https://cdn.sqhk.co/zeliravepuj/bZ3jigh/73134344372.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/M3Apihf/bike_racing_free_download_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409627/normal_603b3c97a49c1.pdfIn PDF document text
    • https://sujolatako.weebly.com/uploads/1/3/4/6/134624807/mejor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366011/normal_5fc93881d1b56.pdfIn PDF document text
    • https://lilufegat.weebly.com/uploads/1/3/5/9/135965666/kugetagito_tejeba_diwololawug_turakaninifibi.pdfIn PDF document text
    • https://zikamesezelili.weebly.com/uploads/1/3/4/8/134857079/3723692.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473640/normal_5fedb8946d5e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406466/normal_5fe4e0943a093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449788/normal_601e1e818c0c9.pdfIn PDF document text
    • https://lowaribopuvege.weebly.com/uploads/1/3/2/8/132814272/zevotizexek-dufaj-senowatojufore-wefodebono.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/7W2jbgj/89989118641.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445866/normal_6018423de719b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453129/normal_605dfa029ba1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_6020a8ea63e71.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/8be5d5fa-3e3e-4721-b339-86bdfef6b4b9/4705606965.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_23418a68c3f549168b6c5ca8ad197c7b.pdf?index=trueIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_af146137727c466f9938a5eedb5a88dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d37e69f5-0f2c-4ed2-bb3c-a2bf69afcecf/best_pe_exam_prep_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/885af9a4-1787-4370-83e4-7cd4ce3b283e/57642438320.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_off0000fe3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3E 5264 bytes
SHA-256: bd5d4799ab4ab9b7d95f92217c788bfc76f38f20647b58b3dae10f6b124e56a0
font_01_sfnt_off00011043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11043 10996 bytes
SHA-256: a4d950e3fffc4e13cb03bf47276487e9e28fbbcb80b9867fde84aa6100e26a1f

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