Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d10235ffc637a1…

MALICIOUS

PDF

76.1 KB Created: 2021-03-24 02:51:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 778d3e05ba7cc35c17b7dcaa35b652a6 SHA-1: 5f220dad18ccf3c31f4fba9d64d418ddce5424ae SHA-256: e5d10235ffc637a14c6f09ea6c0b3e3f53fbd16c7fc84ecc1f6c867361171aff
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 0.9998

Heuristics 6

  • 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.
  • 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://midufefew.ru/strik?utm_term=add+audio+file+to+wix PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475197/normal_604193c5a844b.pdfIn PDF document text
    • http://chestlune.online/how_to_perform_autolytic_debridementeb44e.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/tifezokiluw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_6031685a181b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457573/normal_5fd91a148a79b.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/questions_on_algebraic_expressions_for_class_8.pdfIn PDF document text
    • https://pamimimafe.weebly.com/uploads/1/3/0/7/130775080/sazanugafugano.pdfIn PDF document text
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/6899435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495037/normal_5fd1ab4cbefe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370059/normal_602f37d83143e.pdfIn PDF document text
    • https://zebazowis.weebly.com/uploads/1/3/4/3/134310266/tediduni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420014/normal_5fc6fad4b1d36.pdfIn PDF document text
    • https://rakatifuz.weebly.com/uploads/1/3/5/9/135964199/dativaxat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417813/normal_5fdaaa94e7f78.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/where_do_i_put_power_steering_fluid_in_my_honda_accordacgjq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae635886-392b-4320-8621-6fc8df76fc57/38124894890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47b42772-90ac-40f6-a67d-36fd3eeccbe9/ford_mustang_mach-e_rwd_interior.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d914cf0-fbb8-4a7c-a309-fd9549681cff/64414154586.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_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 4776 bytes
SHA-256: 8d5dcb4ddac9c6e41c5f5615a77f06727685f937571ce010bc15acc693fa71b7
font_01_sfnt_off0000fd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 10704 bytes
SHA-256: b37b9e341c69547c309d419cde2496479d4b54aeef523f88f9ec83e6905ba5de

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