Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc719e897975aa8…

MALICIOUS

PDF

75.9 KB Created: 2021-03-12 19:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 04e4e3bff360a8e606821bf8232eed1c SHA-1: 7eff38cae2bfe378d0c20375c00565b36afb73d2 SHA-256: 3fc719e897975aa844ae35a4f8d9b377bb378ac13802bc9a005f30ad9a633563
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata related to 'classic alchemy hd guide' and wkhtmltopdf, indicating it's likely a crafted document designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://resalured.ru/wix?keyword=classic+alchemy+hd+guide PDF link annotation
    • https://cdn.sqhk.co/viwiratoposu/NdTheij/paws_pals_automatic_dog_ball_launcher_toy.pdfIn PDF document text
    • http://wellwork.site/2702843680z4wc7.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/jjchgnQ/bexojugulumizixezo.pdfIn PDF document text
    • http://fetekozaroxeme.iblogger.org/coleman_powermate_1600_generator_reviews.pdfIn PDF document text
    • http://grantmedica.ru/13711849651dv6gj.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/ivgj0ia/64326404509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474759/normal_601759fee3990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490529/normal_603c53db14f91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376611/normal_5fde7271e90c9.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/ihjhjI9/20369702098.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457561/normal_600264cdc4151.pdfIn PDF document text
    • http://gabubixaj.22web.org/bimilixemefatopavorojuti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tunufefenus.rf.gd/chamma_chamma_video_songs_2018.pdfIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_384fa141832241a0a88e8b0088312151.pdf?index=trueIn PDF document text
    • http://kewivifonawati.epizy.com/sajoludibutaselofugo.pdfIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_e0c7f189666f4316ba7c27abc5b912e9.pdf?index=trueIn PDF document text
    • http://xuvufajozurez.rf.gd/news_reporter_dies_of_blood_clot.pdfIn PDF document text
    • http://dejupaxifitat.rf.gd/posax.pdfIn PDF document text
    • https://fb1cd387-549b-40f1-a5a4-67fd65d29bb3.filesusr.com/ugd/4200b4_2c33ee1762754d3b8d80ee75935b5136.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_6045e4528cc74f22905bd59acaa21f8c.pdf?index=trueIn PDF document text
    • http://tizelimanux.rf.gd/rivitakasotan.pdfIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_5c3ac34c891042c58305d1694d017e44.pdf?index=trueIn 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_off0000ee56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE56 5264 bytes
SHA-256: 5980cceb143f5c890fe830368b1747b1ce30108db0d5955fe274ab782a756774
font_01_sfnt_off0001001f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001F 10064 bytes
SHA-256: ba85e47729a53e794883161e841162ad62fda7d7062067bdd8602f0d8ac6fbac

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