Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd205b050263e60…

MALICIOUS

PDF

87.5 KB Created: 2020-11-27 14:21:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 11ebe8c1605b2562dfca5c0fd0794b43 SHA-1: 9381a4600aafd92ca5fafb969f68703cf64838c3 SHA-256: 5fd205b050263e60f9ead75fa4f056e32e29803848dfb59d47f210826a567d87
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/strik?utm_term=tabela+de+integrais+schaum In PDF document text
    • https://pezufefak.weebly.com/uploads/1/3/4/8/134865979/8bbec08d551e0.pdfIn PDF document text
    • https://letateworu.weebly.com/uploads/1/3/4/3/134365764/bajifolur.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/5f93aef7-b286-4079-a8e1-90f8c28006f3/13065013803.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/jikabuditux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9669cc88-93b3-4319-ac8e-48598d2e65a6/98136841965.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/46867619086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aca434f-408a-4b40-b35e-866822f5d19b/electricians_guide_to_conduit_bendin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2623b7ad-facb-4ab8-b9fe-4be3f31a5ee7/a_raisin_in_the_sun_audiobook_youtube_act_2.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/63674398395.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/apache_windows_7_64_bit_msi.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/65204473358.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/80979727625.pdfIn PDF document text
    • https://s3.amazonaws.com/nepawigexa/penexavolojuzoxumozijov.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 3244 bytes
SHA-256: 38665222235424b47d495b9a65de3512327011cb8f6814f08f667b62ddbced12
font_01_sfnt_off0001073e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 5444 bytes
SHA-256: 3aff6a43658a566da642313ad46cdf9673c09fd9352b2a6fa21782cf1b2045ad
font_02_sfnt_off00011988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11988 2256 bytes
SHA-256: 3e43d276a1ad8587ec7865db23b45c7bb448128bcaf74437da4f9d8330046935
font_03_sfnt_off00012310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 15672 bytes
SHA-256: b9bfea4053099d0104254f14d5dd049ae92b4bd5c27cf11d6eb1cabdf6af2649

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