Malicious PDF — malware analysis report

Static analysis result for SHA-256 09fa65773b40acb1…

MALICIOUS

PDF

75.4 KB Created: 2021-05-06 20:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ec3059fad1bec77a26a5bbedec0adae5 SHA-1: 58cededdd7e3514766e8aa0ce96a5ce75abcb1e9 SHA-256: 09fa65773b40acb1fda72bf703816ccdaab59f1bd84594ae9a1877704e199592
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 0.9999

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=how+do+i+change+the+clock+on+my+echo+show+8 PDF link annotation
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/wajujumamavij.pdfIn PDF document text
    • https://numetoximo.weebly.com/uploads/1/3/4/7/134717633/459862.pdfIn PDF document text
    • https://cdn.sqhk.co/laxuweredex/7ieSsih/teamviewer_9_free_cnet.pdfIn PDF document text
    • https://gojemafofapuvog.weebly.com/uploads/1/3/2/6/132681271/5318908.pdfIn PDF document text
    • https://doxibizogo.weebly.com/uploads/1/3/4/8/134893922/lugufokopi-bixolodone-kagoxeginedaw-xuwuxaxusajoti.pdfIn PDF document text
    • https://cdn.sqhk.co/xejoverol/wgcEbzt/97001052027.pdfIn PDF document text
    • https://bufogepuvuzi.weebly.com/uploads/1/3/1/3/131381066/4532740.pdfIn PDF document text
    • https://ganalazukomej.weebly.com/uploads/1/3/4/7/134714395/sizebe.pdfIn PDF document text
    • https://nedotumawu.weebly.com/uploads/1/3/4/6/134626041/976000.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/xojafemori/child_welfare_information_gateway_2008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a4c06c0-fb34-4ef4-a2f2-40897e37bcf2/81746718151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b35cf31a-e99b-420b-be94-73722d4c0248/phet_interactive_simulations_balancing_chemical_equations_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa7554f-adf9-49bd-8b4d-44d898892d37/how_to_repair_a_whirlpool_washing_machine_that_is_not_spinning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/257ae4ef-e395-4c3c-a739-b3963c2f8c47/72333334050.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/fafibobekugop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aafd5e80-6fa9-44a0-8309-431f7ee92950/maytag_dishwasher_mdb4949sdm2_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8d26c56-6672-4c40-b716-e0781e2ac5dd/41546174849.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/43469559218.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_off0000e7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FC 5672 bytes
SHA-256: fe92e4aa4a8fa86adeb3a75915bff41c6fd1ef4355e566b556e0c3fe519987c2
font_01_sfnt_off0000fb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB41 10896 bytes
SHA-256: a6cb6f4c47cc8b2c5e65372b2860714dd0cc138b28a0a0118d17058266bcc28f

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