Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eee137624ef2548…

MALICIOUS

PDF

76.8 KB Created: 2021-04-09 05:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a1407043ba438f5fc3fb9eb77bc708e6 SHA-1: 97f14dcede088a399a11772799a433d45806b5f0 SHA-256: 5eee137624ef2548dc099151e814f5a7a6e2857236250fe3b1a2e8b4742ae1ac
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

Heuristics 6

  • 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 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.
  • 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://pelibifir.ru/strik?utm_term=sample+letter+of+intent+for+job+vacancy+pdf PDF link annotation
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/9b7a29066d39.pdfIn PDF document text
    • https://xizovetezewo.weebly.com/uploads/1/3/2/8/132814166/3393604.pdfIn PDF document text
    • https://bezofaxifi.weebly.com/uploads/1/3/1/6/131606652/8673994.pdfIn PDF document text
    • https://muwegegedagus.weebly.com/uploads/1/3/0/7/130738526/e8b6e9b0.pdfIn PDF document text
    • https://madoguwulivusi.weebly.com/uploads/1/3/0/7/130775056/04ceb71c817.pdfIn PDF document text
    • https://jopegivev.weebly.com/uploads/1/3/4/2/134234712/vogulopeta.pdfIn PDF document text
    • https://zemapefim.weebly.com/uploads/1/3/4/4/134485651/xikodobegakife-susifetujawof-filexiwixur-vozexal.pdfIn PDF document text
    • https://wogazisaralo.weebly.com/uploads/1/3/1/1/131163660/dffa979a871.pdfIn PDF document text
    • https://zuripiri.weebly.com/uploads/1/3/1/8/131856797/654ef64a96c95.pdfIn PDF document text
    • https://lijotabele.weebly.com/uploads/1/3/4/0/134016876/dekomopelatej_jurosofub_razejizifaset_gasexag.pdfIn PDF document text
    • https://getedizexagan.weebly.com/uploads/1/3/0/7/130740146/5750204.pdfIn PDF document text
    • https://serekarivevug.weebly.com/uploads/1/3/1/4/131407867/sudimiwok-puvanafizap-gageluwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_d1c5481219664101b98e55deb52aaa59.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c6c0f63-0a96-4851-aed1-4fbfd2f04046/how_to_find_width_and_height.pdfIn PDF document text
    • http://gakilasefit.myartsonline.com/18066847616.pdfIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_8f2690800e9345d79bc05812a9990768.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a191956d-4939-4153-9a1f-2f3806b860c1/bevolagenifaronazak.pdfIn PDF document text
    • http://jokosen.atwebpages.com/what_is_the_best_water_cooler_dispenser_to_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1b84c49-d803-4a6e-b6f9-4dc5ac6418c5/42434286351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/851a656b-c49e-4570-a665-63d0e1778a51/java_programs_with_output_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6de0578c-acca-4548-a950-e1ab4d7099de/risenebubenatu.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_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 5604 bytes
SHA-256: 7c4feca96cc1644a7b06374ed2e7aee9a7014d2c30c3e35edf9bb60691dfc235
font_01_sfnt_off0000fea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA7 11356 bytes
SHA-256: 103260890782c9d112a25cb6dc24d1573a9056f5f197e6d6903c691d3dcc09b7

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