Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f19c9c3d5bed28…

MALICIOUS

PDF

77.2 KB Created: 2021-03-06 12:44:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6ec8b99a1e4c69fe99147f74d03dfe55 SHA-1: 8dca1868779fc806e8fe955d281d681d79c01d2a SHA-256: f0f19c9c3d5bed28a646461ab31cc6287fabf1ff6cd507e53eebd59cdea23a30
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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://jacksth.ru/123?utm_term=cognitive+biases+and+decision+heuristics PDF link annotation
    • http://parhelifrl.space/zutamasewolidalixrogwj.pdfIn PDF document text
    • http://instapriz24.site/868846298525hhbn.pdfIn PDF document text
    • http://mscgis.net/graco_solano_crib_to_toddler_bedmid5g.pdfIn PDF document text
    • http://webmastervlad.ru/76895813903kx9vw.pdfIn PDF document text
    • http://good-production9.site/sunbeam_electric_blanket_controller_bl0400m5pu2.pdfIn PDF document text
    • http://1xbet-football.fun/deguluremogawedisuzajera0czd3.pdfIn PDF document text
    • http://themarkuzmusic.com/9577870818yta51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470540/normal_5ff8993181370.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408862/normal_5fe34b36820ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471249/normal_601b2f278e7fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472186/normal_5fddbac40897b.pdfIn PDF document text
    • http://optamorem.com/85119353797z9yjz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505687/normal_6042c33665684.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406466/normal_5fc7433682f80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413362/normal_5fde822711f14.pdfIn PDF document text
    • http://topsale.pro/498341209023ch7g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_6041671cd4606.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/what_to_bring_to_nurse_interview.pdfIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_12bb90cacf354994a468e0faf57484c9.pdf?index=trueIn PDF document text
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_6200eec6ab2d4d1c95482ffda36a43b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fikuvine/kuxokodeguvowezuku.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/53989171008.pdfIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_d786beddf2144e2ea521ada7d7f7e009.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/gujemujidosodotudova.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/plant_vs_zombies_2_plants_guide.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_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 5276 bytes
SHA-256: 75636bb2d6c5f66b9a5c019d9e6bb4aab1446e38abdcdeadaf331ce36b49afaa
font_01_sfnt_off00010376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10376 10228 bytes
SHA-256: 27802c4b9fe287f77889c749e339d1897a580601f0d90019f76a9192fe018ace

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