Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3db8dd9e9a99e8…

MALICIOUS

PDF

76.3 KB Created: 2021-04-23 20:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5e66890ea04feac6abf2c05fa56508c7 SHA-1: b05f32499fc314b0080df1f4f803d95c74103d14 SHA-256: 2b3db8dd9e9a99e82467ce3408ef14bd6187d7b955204f3715853aaa629e167d
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 0.9991

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://baarspo.ru/strik?utm_term=why+does+my+car+say+ice+possible PDF link annotation
    • https://dovoviwum.weebly.com/uploads/1/3/0/7/130776035/710639.pdfIn PDF document text
    • https://pokumajapemen.weebly.com/uploads/1/3/4/4/134490217/9779089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464850/normal_602e7f1350d6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473622/normal_60096299ce4a1.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/parizoni-gigagel-kovuza-koteluxufe.pdfIn PDF document text
    • https://pabitunevogozut.weebly.com/uploads/1/3/0/7/130776295/daxofufaxuvomelujeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381083/normal_5fda5a497f890.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386361/normal_6026a9211bca4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391621/normal_600483113ae32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501645/normal_60478506e8c97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_5fe859a1e68bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473947/normal_603c76476548f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449776/normal_604b0a0be8c11.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/b16fff9e-0fe5-4b2d-bf83-45be341fdc44/pobozadinirekurijo.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/how_to_get_linksys_out_of_bridge_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/precalculus_textbook_pearson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f551a7d0-592a-4118-877e-d9526cc39a99/31296712930.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/bcom_1st_year_english_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/verbos_irregulares_en_ingles_y_espaol_pronunciacion.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/festivals_around_the_world_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/vavemox.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/what_charger_can_i_use_for_ps3_controller.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/pokapulivezovawuxirivev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c6345fd-cc40-4275-a6b2-b0f7a2bcd685/42048563376.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/what_are_covid_19_regulations.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE99 5568 bytes
SHA-256: 9814acf61f89f93bb357b9a98a8b1bdab461b911d6d652d5e7fca2faa2df823f
font_01_sfnt_off00010166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 10016 bytes
SHA-256: 8e197895e5e959180d0f2927c0ff5eca783c1eae74e127a6aeef10a498b78abf

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