Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49545d2917e811a…

MALICIOUS

PDF

75.6 KB Created: 2021-01-02 09:39:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 211f4164d92ca22a049d47dde8fb1b2e SHA-1: 9884af43d275795b7aa082311ca79e890fcd76ce SHA-256: a49545d2917e811a482dc77312b1f12c7d06eb98d35a66925dd155aa17a79507
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, suggests a lure related to 'speech therapy goal bank for dementia'. The presence of numerous external URIs, including those hosted on Weebly and S3, points towards a potential phishing or SEO spam campaign. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://traffset.ru/123?utm_term=speech+therapy+goal+bank+for+dementia PDF link annotation
    • https://josudirojupa.weebly.com/uploads/1/3/4/7/134729494/rijavu.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/VPSifhh/syrian_hamster_rescue_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388612/normal_5f8d52af67383.pdfIn PDF document text
    • https://tepogixe.weebly.com/uploads/1/3/1/4/131437844/3090795.pdfIn PDF document text
    • https://cdn.sqhk.co/retepisej/iemjO6G/new_car_sales_manager_jobs_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/xeliwiwogivo/hdrTggp/my_talking_parrot_game_download.pdfIn PDF document text
    • https://digulowewuw.weebly.com/uploads/1/3/4/3/134363346/9fc3d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f8ed46f597bf.pdfIn PDF document text
    • https://cdn.sqhk.co/xowuzaseku/IZb2hhi/69591832009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495988/normal_5fbbf0235449b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/somamere/debazesesifawugeluzowod.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/mean_median_mode_worksheets_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/rirasominix.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/character_sheet_builder_d_d.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_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 5800 bytes
SHA-256: 7454f48cf0ba719499f37a9a613fb4b8edd2404b78c23459fc8a7dd736e739e6
font_01_sfnt_off0000fd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6D 10684 bytes
SHA-256: 1f08a7bab133069a4f0f5ebdf70eb2ad58562acfc26d157c5e059bc7311b7fbd

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