Malicious PDF — malware analysis report

Static analysis result for SHA-256 29cb2a16a79223fb…

MALICIOUS

PDF

67.9 KB Created: 2020-12-06 04:51:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 24d6b2d2a49db9fc1fbb3300888189c2 SHA-1: 55365be6ca2063fa2b5667220dbdaaab1ce52697 SHA-256: 29cb2a16a79223fbfdc0d7e11f9f876d0dab24b5fad68992907701c8a27ddde5
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://traffine.ru/wb?keyword=guideline%20stroke%202011%20pdf PDF link annotation
    • https://semebikifotiz.weebly.com/uploads/1/3/4/7/134752265/batafatofu-pimom-sesurebine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0f186bda9c57a97be6d6b/t/5fc1d7004f98375720235032/1606539010195/mutations_worksheet_deletion_insertion_and_substitution_sickle_cell_anemia.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b4ed405d5340f34a953a/t/5fc988c141142a3c4b350ba6/1607043267087/sell_gift_cards_for_bitcoin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c09ddde-853f-4d4c-bd55-389d25bb6d1a/jilokusumolebunidilopipa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc730841969b523a41f6cce/t/5fcc2e3074a40730fb8aa990/1607216693117/seliseseno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d9e34aa-ea3f-4e6b-b738-83a521bb66e7/15692881743.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf48ec3570fb44d1f8bdcc/1606371566434/fizonanutipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0690572-6d9e-4920-8fe3-9f6cf29ae7f9/wobalugokonerazemakenow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f2c10f1-75e4-4f45-a77e-e26e93c4473e/thompson_v_oklahoma_impact_on_society.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf8eb3c02f22b9dd30b58/1606285548124/water_erosion_and_deposition_worksheet_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5754e18c5c478ef30ed8/1606375253238/a_monster_calls_study_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dbcbbf71053ccb0ffb78/t/5fc3fc73f3de5e49b5e016a1/1606679668622/beacon_theater_sumter_sc_phone_number.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_off0000cfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE9 5248 bytes
SHA-256: 17c11d75a8d776b727cefc186d8d45b70fbff9f4cdb872b1a479f8f52dab625c
font_01_sfnt_off0000e1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E1 9692 bytes
SHA-256: 0fcbe6ae2b1c181b78f94aa8e969734abdab4fa4cd9f3929ba7cb5abe79bf637

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