Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe43089847e3254b…

MALICIOUS

PDF

75.4 KB Created: 2021-03-31 15:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8be7d6374bf62886e975388cb27faa8b SHA-1: d032afd42f248626639145336bb3df1ea3e44230 SHA-256: fe43089847e3254bead77277af19c51cabba8fa6e8bd7bd8d4817167ebfde7ae
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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 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://vilenefex.ru/wix?keyword=create+scatter+plot+worksheet
    • https://kesiwupi.weebly.com/uploads/1/3/1/4/131407351/74f8263963e8bb.pdf
    • https://cdn.sqhk.co/luwiwaduna/YV0sdjh/good_knight_story_sword_of_destiny.pdf
    • https://xixemoxutosiseg.weebly.com/uploads/1/3/4/4/134473276/9151979.pdf
    • https://pexajutamog.weebly.com/uploads/1/3/4/7/134759810/mesavupexum.pdf
    • http://bigezidara.mypressonline.com/aircraft_maintenance_manual_a320.pdf
    • http://fawejidiribap.22web.org/xakakatisalalaji.pdf
    • https://boleturem.weebly.com/uploads/1/3/4/3/134398498/4622247.pdf
    • https://cdn-cms.f-static.net/uploads/4420031/normal_60182420471b0.pdf
    • https://static.s123-cdn-static.com/uploads/4376602/normal_5fcb6b9c07487.pdf
    • http://fibisazorowax.mypressonline.com/child_development_and_pedagogy_in_tamil.pdf
    • https://cdn.sqhk.co/semegopo/hgh8hj3/pawakezabotubalizej.pdf
    • https://cdn-cms.f-static.net/uploads/4389084/normal_603b46b461b1c.pdf
    • https://cdn.sqhk.co/sokaxopoje/HngjXHz/87578812014.pdf
    • https://fujerituzaxu.weebly.com/uploads/1/3/0/7/130775231/5404411.pdf
    • https://cdn-cms.f-static.net/uploads/4502248/normal_603a697c7314a.pdf
    • http://lazotub.mywebcommunity.org/craftsman_circular_saw_blade_removal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wowupopokidejol.rf.gd/29704032367.pdf
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_2c50607713db4a9387db17482e092d99.pdf?index=true
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_490111c0f72744ea9515c21fa251f691.pdf?index=true
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_1fdb3037bec24d8ba23023a8fe8d49b3.pdf?index=true
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_8aa100c1f3ba416994df602fe70a4ce3.pdf?index=true
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_a4d962c575e74a53a33015db56fe87c4.pdf?index=true
    • http://xogopaneb.epizy.com/34644819997.pdf
    • http://tuwafexom.epizy.com/fupogatozidijepuribug.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ad.bin
7f06c67ecc41d425710c7f5d59e827e865ecfb4a2329a3b64354c6c9e98e3d85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 5084 bytes
font_01_sfnt_off0000f8ff.bin
cfa2d1024a5657640d008b596c80d11fecab70755439a50245c887e3ffd16ea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FF 11796 bytes

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