Malicious PDF — malware analysis report

Static analysis result for SHA-256 477340db98ed5719…

MALICIOUS

PDF

81.7 KB Created: 2020-12-17 07:12:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 351492ece15b1b6c484a601dcb80084a SHA-1: 3dd31d5caf2f3d9de4e301176d3636c6b04b5a08 SHA-256: 477340db98ed57191c2a607fbcd754bd18ee2c69db55e92305e6771fb25986dc
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=torrentz2+search+engine+2020+download In PDF document text
    • https://vukaxibunima.weebly.com/uploads/1/3/4/8/134885707/f55c13a27.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/448ec1b3-ffb1-4b8a-84b0-a2f5341799eb/10018084395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17b88266-0f27-48f6-9d91-48bb696e79d8/wot_server_down.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3fff594-3972-4aaf-866a-2a8b07c19641/mipuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0092cd62-5584-4b17-95fc-1325b7264fa7/bosquejos_de_sermones_bautistas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12fccc7c-9a30-4022-b8fb-b8ed11a0400e/bomelogevikewetiw.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/fubijupiw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcdee90888ad70830b9c456/t/5fce2c422bc7884852dee3f1/1607347268003/wupime.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe14893c6ccf69f3268983/1606292618944/nested_if_statements_python_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/874ed255-f451-4837-8e5b-7ab98ffaca89/18__stockton_ca.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/toxic_wap_free_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cee0e090-bfaa-4bf3-ae76-9777268970a8/58075535079.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 5356 bytes
SHA-256: 2e5ec7da56b3f1a26dde31ffb0035f3f80ae473355ffcb9314e22f21074883e8
font_01_sfnt_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 10580 bytes
SHA-256: fef7b3c6dbf21b3f60cbf5e96e104f34ea4857f9c251750c00b8f83d4a52fce9
font_02_sfnt_off00012bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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