Malicious PDF — malware analysis report

Static analysis result for SHA-256 871e0026d938aa35…

MALICIOUS

PDF

81.8 KB Created: 2021-03-08 18:54:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 40660f27f592a62b2206f254bd98e1a3 SHA-1: d9a51b468236d7c3703e688bcc77c132bdd879e8 SHA-256: 871e0026d938aa3532673547d1dc2a45131c3aaf9b1257559f0202b88506b26b
156 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 0.9998

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 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.
  • 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/123?utm_term=estonia+visa+form PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426413/normal_5ffd86e3c5009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448744/normal_601ff425d1b7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481068/normal_5ffebf9fe9265.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465685/normal_6001bd46ceb9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404757/normal_60253b09a34b5.pdfIn PDF document text
    • http://zozamowewideno.mypressonline.com/forex_trading_tutorial_download.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/18348999702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383156/normal_6028ff1ac8f7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494663/normal_602a36385d1f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_2a6d211aecd243c692f13d69b9d07761.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/daxemo/61662002130.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/14279457000.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/reading_comprehension_grade_1_worksheets.pdfIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_12451547903542dcb8b5848a5eec2f66.pdf?index=trueIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_03493306d5ce4f539830a37f03ba7581.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutogugej/fotasovugopabipobinos.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/91966080587.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/mystic_messenger_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/advanced_aircraft_analysis.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001027e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 4900 bytes
SHA-256: 967b9f06428d691f57653cd3250262f8b965bf561d7c23b5f1852418c2f89d36
font_01_sfnt_off0001131e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131E 11104 bytes
SHA-256: 54f327de28a5aa3556f1c9ff3c683132509d8f6bcaccc7bf782625167c42af53

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