Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1203514096dc02…

MALICIOUS

PDF

92.5 KB Created: 2021-05-13 12:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5dd91d0823ebe4487f0ad07d718043a4 SHA-1: 5203c2207b8b4b7767141eebfc3475a948fb9ae5 SHA-256: bc1203514096dc0252f63e7dadac8b3edb1d36684e3d5d5e326aec944a543803
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/strik?utm_term=ramakrishna+math+courses+2020+admission PDF link annotation
    • https://cdn.sqhk.co/fololekumi/ggi8ib3/piano_band_dj_download.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/jgjgKhj/mirror_neurons_autism_therapy.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/ifLjdhd/zamamifitupomokiterilu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pavemamixazose.rf.gd/canoscan_lide_220_400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8c0a4b4-2836-4bff-af3a-ef9ae5f705c4/4_quart_crock_pot_breakfast_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/75725683306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0862146-13a6-43e5-9e38-486ceecc41ec/logic_and_truth_tables_worksheet_1.2_answers.pdfIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_b14a028675134a4f8415a74796c7b509.pdf?index=trueIn PDF document text
    • http://jatuxijor.epizy.com/south_africa_worship_song.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/china_culture_information.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/earthing_sheet_science.pdfIn PDF document text
    • http://sigadoba.epizy.com/is_there_a_part_2_to_the_darkest_minds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e298351-b6a0-4686-a3db-061bfa417bc3/75682113739.pdfIn PDF document text
    • http://nigaroseda.rf.gd/xewekekavovenuwogejemaju.pdfIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_3aa668dc248d44d4be7e4b835ec0256b.pdf?index=trueIn 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_off00012bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDC 5492 bytes
SHA-256: c2c01095779ba073c2889cc453d9d3c1f148c79b30cc6ba27a7d5722367e9be6
font_01_sfnt_off00013e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E61 11416 bytes
SHA-256: d51a09f8935525aff52c5ad734fa1190b80b082663e5beaad295da79dbfb11dc

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