Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a8d41f65cdd7b8…

MALICIOUS

PDF

73.3 KB Created: 2021-06-03 05:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 90532e73f68dcc1a304492bd4be3314d SHA-1: ea1aec34d7b7fd2dc73dde8a8b89e030fc6bf365 SHA-256: b1a8d41f65cdd7b8bc68577450bf479c2f2cd986c70c8707045f82ea0a62c6c2
186 Risk Score

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 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://baarspo.ru/123?utm_term=3d+human+anatomy+atlas+free PDF link annotation
    • https://vafumuwolefuz.weebly.com/uploads/1/3/5/3/135325426/taxari.pdfIn PDF document text
    • https://kigolakelo.weebly.com/uploads/1/3/1/3/131380934/wafosew.pdfIn PDF document text
    • https://rogebupapopax.weebly.com/uploads/1/3/0/7/130739826/sepemelilefo.pdfIn PDF document text
    • https://zatimitopefavig.weebly.com/uploads/1/3/4/6/134614657/faxitilupovogumu.pdfIn PDF document text
    • https://nogapixefakul.weebly.com/uploads/1/3/4/5/134590999/5912370.pdfIn PDF document text
    • https://gevotasi.weebly.com/uploads/1/3/4/3/134389209/34732d2eb5b576.pdfIn PDF document text
    • https://tofikopu.weebly.com/uploads/1/3/1/3/131381225/5428081.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/2461844.pdfIn PDF document text
    • https://senamevab.weebly.com/uploads/1/3/4/6/134689233/jemadises-kedekutumu-nuresuz-nazuj.pdfIn PDF document text
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/3e5475fb.pdfIn PDF document text
    • https://mubikopupisuf.weebly.com/uploads/1/3/4/7/134711770/cb25a15af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zowonixepor.pbworks.com/f/s30-s1b_remote_manual.pdfIn PDF document text
    • http://fadoposapat.pbworks.com/w/file/fetch/144448389/81225290691.pdfIn PDF document text
    • http://katafuzum.pbworks.com/f/vumokosedab.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/w/file/fetch/144504342/pulexadixavasov.pdfIn PDF document text
    • http://bezawagiga.pbworks.com/f/revikexolazerafal.pdfIn PDF document text
    • http://jebusolole.pbworks.com/f/wumozib.pdfIn PDF document text
    • http://godekazonigi.pbworks.com/f/50304372295.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/w/file/fetch/144485613/51146365724.pdfIn PDF document text
    • http://pudamalulera.pbworks.com/f/62110403311.pdfIn PDF document text
    • https://medlineplus.gov/anatomy.htmlIn 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_off0000e2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 5316 bytes
SHA-256: d0cc6cfdd48f1f0ba8a8340c0f0c7b4900a547680f7c7da4b39baaf2eb91f37c
font_01_sfnt_off0000f4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C0 10440 bytes
SHA-256: 9866e636b8cd011c458cbfc979b7b0f7f9406c8e8f00ad07f24f11762891567f

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