Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8f4a48ae9c7ded…

MALICIOUS

PDF

79.8 KB Created: 2021-03-17 13:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9641f5b6aaa0154441cb3990f146a262 SHA-1: 206e4af799ce1945a4bcf31db582f6f97c2f80d7 SHA-256: eb8f4a48ae9c7ded60a4bfe9c8cf39a81a275878b9f7d4a31eb23fcab3478a56
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-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.
  • 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://fokemale.ru/strik?utm_term=joni+mitchell+slouching+towards+bethlehem+meaning PDF link annotation
    • http://motorutovibipe.sportsontheweb.net/what_are_the_characteristics_of_naturalism_in_literature.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412895/normal_5fd0bcf3d795b.pdfIn PDF document text
    • http://motorutovibipe.sportsontheweb.net/sikonutosenugesenadi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_601d24c321558.pdfIn PDF document text
    • http://aduo5.online/pidurofozu9rs.pdfIn PDF document text
    • http://bestrongbyg.com/deltora_quest_lake_of_tearsnb8ld.pdfIn PDF document text
    • http://edevletorg.com/26301062460iuu6a.pdfIn PDF document text
    • http://grinallex.shop/valores_y_antivaloresfzj77.pdfIn PDF document text
    • http://50offstore.pro/fekufedesopuxdvk2.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/9981795e-cbd7-4dd3-b081-2eeb2b52b735/equate_wrist_blood_pressure_monitor_error_3.pdfIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_bde6aa19393b4c1298678a40db6f6d21.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8ae1d9e-33a2-44d6-b21e-0e43fecfb8af/92042431248.pdfIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_5e9c642dbdc942c3af7eef7d3974f9a8.pdf?index=trueIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_e688d0989576453da3f69cfd4838c6cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fdabf61-a909-441a-8ffd-3ba91fdfe995/famivimata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fce2ab00-3d5c-4743-955a-a80f63b1886d/mutaroxade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbdb6ee2-c4fb-4115-bc22-0189ce5e787a/zifeguvigix.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C9 5572 bytes
SHA-256: 86f42eea25f8afbc668ab9bb55f844536b947616514c32a18ae056436bf6e1f5
font_01_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 11128 bytes
SHA-256: de8b8bb2a906f8b6a864f5f1da92610b7f9e4a5351fa925a3caf59a222512d59
font_02_sfnt_off00011acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACD 16120 bytes
SHA-256: b7e50b4ffc51414b497b83e1c37832b50a1496d8a45572e2d735ba942d92f8a1

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