Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa92f8bbac037800…

MALICIOUS

PDF

77.8 KB Created: 2021-03-25 07:08:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4e89ced82a6945d76178da6b74c47ca1 SHA-1: 12d801f6683e974dbbd8af272c5ff1806631a322 SHA-256: aa92f8bbac037800eae79159989998bacb3c1c0d41491e6a5e523cae2553a051
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://druttle.ru/123?utm_term=malaguena+marching+band+sheet+music PDF link annotation
    • https://cdn.sqhk.co/nizivatitogu/ifgchjw/playhouse_disney_shows.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426679/normal_5ff5902a9436f.pdfIn PDF document text
    • https://cdn.sqhk.co/sudidoxa/bydWtbL/top_ten_werewolf_movies_on_netflix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381543/normal_5fda4179a61eb.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/3qgrqje/slicer_knife_description.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428331/normal_603fc7ee824c0.pdfIn PDF document text
    • https://cdn.sqhk.co/nivabetaz/WWsGShg/new_update_from_samsung_experience_service.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380073/normal_5ffb338909b14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_f9a2088a28d94e71b6e78ad79fb3c739.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gulapore/homeready_income_guidelines.pdfIn PDF document text
    • http://zesivukawavomu.rf.gd/google_chrome_adobe_flash_player_download_failed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6b7878a-f102-4f9d-83d2-bbc54a56e01a/68608439072.pdfIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_35a1dae5c48a42f9890391e6bc8e05cf.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_c944351e486b4c7296b2e63c25f3ddee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecf2d069-6760-41df-9bf2-9e8b3813d744/molodof.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_d3a674a103344f0bb3ae9d91e9afcb0d.pdf?index=trueIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_371ca4ea7a404764bfec3cdddd32f20b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/mailing_labels_from_excel_worksheet.pdfIn PDF document text
    • http://losisotudek.epizy.com/catanzaro_informa_facebook.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_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 5500 bytes
SHA-256: 1a85705bc094e3154da4fb78a0ff5883ab8ebcc4819130d98b028f2f162e0427
font_01_sfnt_off0000ed20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED20 11868 bytes
SHA-256: 22539aafaf1833b90c803ec783d9efa64d39172c03a2ffc9f0d96898f1e78162
font_02_sfnt_off00011570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11570 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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