Malicious PDF — malware analysis report

Static analysis result for SHA-256 d434c03d152cd75b…

MALICIOUS

PDF

79.0 KB Created: 2021-04-26 02:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cde79853a0c7fc3f744102a1ae5d85d2 SHA-1: e24a43d1b4ce878a8133cbba5270f097deda11bd SHA-256: d434c03d152cd75b5e2206ad3f3efca7c968bc9965f00ee272fdbe1d00711dea
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, and the presence of external URIs further supports this. While no scripts were explicitly extracted, the PDF structure itself likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=information+retrieval+techniques+nlp
    • https://gukozorupo.weebly.com/uploads/1/3/1/4/131411088/f91d65.pdf
    • https://static.s123-cdn-static.com/uploads/4380413/normal_5fc85ddfecc38.pdf
    • http://seluluxafej.22web.org/33178753398.pdf
    • https://girowotejetut.weebly.com/uploads/1/3/1/4/131406843/6549663.pdf
    • https://cdn-cms.f-static.net/uploads/4443617/normal_606597418a593.pdf
    • http://zagodutaf.getenjoyment.net/81790876211.pdf
    • http://timedezalug.iblogger.org/sika_armatec_110_epocem.pdf
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/mejanefumeluwa_lokiw_talipijeb.pdf
    • https://cdn-cms.f-static.net/uploads/4369935/normal_60481b18520bf.pdf
    • http://zugobopepoj.sportsontheweb.net/statistical_learning_theory_book.pdf
    • https://lefojokux.weebly.com/uploads/1/3/5/3/135399193/3016959.pdf
    • https://cdn-cms.f-static.net/uploads/4381539/normal_6039686c6f1b2.pdf
    • https://static.s123-cdn-static.com/uploads/4495043/normal_5fc7e2d19b9dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pupagerirawax.myartsonline.com/zibutagojasafawilamanet.pdf
    • http://funasuruwet.epizy.com/cpp_death_benefit_application_information_sheet.pdf
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_3f2cbbe4ccf347a59ed41563e8503c59.pdf?index=true
    • http://nisuzadusidu.epizy.com/55282301810.pdf
    • http://sewadereweben.epizy.com/37437619555.pdf
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_3cefda6448ae4bde9249f171697de297.pdf?index=true
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_56e27f11660a49b5a58320579138f6d6.pdf?index=true
    • https://6f0a1f77-3195-4c90-aae7-8e5805bb56bd.filesusr.com/ugd/f94fd0_517af702cf8d4125ae0a69e6bb36757c.pdf?index=true
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_343f9eca47a44c5185ba1d813b4a940b.pdf?index=true
    • 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_off0000f805.bin
f2c02d70d2c22129932d184384b1265545f915a9d3c1b8ed1451e80fadf88d5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 5376 bytes
font_01_sfnt_off00010a30.bin
d24158f2fefc0f27377c1fb59b784fad9efaa0d023526b9559f29868535d9df1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 10884 bytes

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