Malicious PDF — malware analysis report

Static analysis result for SHA-256 af16e578235b40fd…

MALICIOUS

PDF

77.6 KB Created: 2021-04-01 07:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1a648cd9b1926f33aface3c8de834bee SHA-1: cc5a14e3e3336fc1398a24430f3215a9cd09274f SHA-256: af16e578235b40fdfa0b2ff3e6a87e8aff3ad598c02115f0a8b14534efb8e597
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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://resalured.ru/123?utm_term=boy+baby+pictures+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369905/normal_601e607b4badd.pdfIn PDF document text
    • http://motorutovibipe.sportsontheweb.net/36771016313.pdfIn PDF document text
    • http://tefuvawilutir.mypressonline.com/wastewater_management_introduction.pdfIn PDF document text
    • http://goodsun.space/buninoresivalefaralererx9uv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484804/normal_605be8c8b538f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_603eeef944013.pdfIn PDF document text
    • http://katermore.ru/favobunetu6jeso.pdfIn PDF document text
    • http://fumuroruzej.medianewsonline.com/vilagatikile.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_b77e7a5e8ea8414998c8fc5935a6ac13.pdf?index=trueIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_5ee8d40a0a1b48de9da6528d7cd0630f.pdf?index=trueIn PDF document text
    • http://tasetexogop.epizy.com/lord_of_the_flies_chapter_1-4_questions_and_answers.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_7a63a61fdc8e49a29116f445f7b59f81.pdf?index=trueIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_5f1462aebd074ccb8e64c2054394576d.pdf?index=trueIn PDF document text
    • http://movetodosewa.rf.gd/89034609927.pdfIn PDF document text
    • http://tolerikaduvutef.rf.gd/ranijalexawufinose.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_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 5268 bytes
SHA-256: e2da263e12681c8e1f514326e47bf9250423c46939f468ec84703cc73ca641fe
font_01_sfnt_off00010540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10540 10772 bytes
SHA-256: 5176fc3752c01c32fe7fe1dfc8c1b14f2334233bc97c91b307c4b9d219b09842

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