Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4f5970e68d80cd…

MALICIOUS

PDF

76.6 KB Created: 2020-12-13 20:48:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b2770bdf7119d5cec5076ccc5723f072 SHA-1: 177771ffda218e129cc85cc966d414fb1b38e217 SHA-256: cb4f5970e68d80cd3a98db8776a82a9e176028b789cc34036174d5888b683045
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=fec+form+3+schedule+a PDF link annotation
    • https://najunores.weebly.com/uploads/1/3/4/3/134381484/pajudonimoseju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406785/normal_5f9e6ad14b8aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_5fa7f97da659a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_5fa2b197a830a.pdfIn PDF document text
    • https://tuwikoli.weebly.com/uploads/1/3/4/3/134312541/8946730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463830/normal_5fbd82f8ecf54.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/91405742-c09c-48e1-92b4-a9cb63554807/kahoot_hack_auto_answer.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6b9d1c43b171198859c62/t/5fc9c7944e3f3d25173c1528/1607059348740/nitiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c0e324d-c716-4fff-8c46-f9485c42eb6e/voxoj.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1bf9145a8629dc791d6d/1606294523136/tofu_ice_cream_recipe_the_kitchen.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5aae9affbf90a660b10b8/t/5fd1eeafad61ab58318dea29/1607593650938/animal_jam_play_wild_login_page.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3d58812facd59cebf5847/t/5fc9c6b22e4d7f67ca2b06f0/1607059123630/physics_class_9_chapter_1_numericals.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcdfbfff169c371838517d2/t/5fd136c94cd2f405fd5ca291/1607546571255/filter_zoom_di_tiktok.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f7b9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF7B9 25420 bytes
SHA-256: 8f76eb60419d9001c4c7a5b891e3c8992cca8d399432ad60c59ce5fe6d4a380e
font_00_sfnt_off0000c13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13A 5380 bytes
SHA-256: 56c2ab410ca5a3bfb4db4c3492b29050e8382636af8397eed4c7853b48807d72
font_01_sfnt_off0000d35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 10596 bytes
SHA-256: 1a5f35c6816f74ef3822fabdb04e6d6843b8613ca3ba0d8b0f0ff945c8cf17e3

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