Malicious PDF — malware analysis report

Static analysis result for SHA-256 241823949a1b6351…

MALICIOUS

PDF

69.3 KB Created: 2020-11-24 12:22:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ddb38c5139d4cdbba91eb0f8a97388c2 SHA-1: d2e5e889328655f3245d81547808e0c12b80df78 SHA-256: 241823949a1b635100bd98823a387298b0bae3fc4cfb34c97803a172a9b19c8a
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 0.9997

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 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://traffking.ru/strik?utm_term=matematicas+3+eso+anaya+soluciones+academicas PDF link annotation
    • https://wovuposekase.weebly.com/uploads/1/3/4/6/134613379/6368546.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/ruzaganog/big_paintball_script_pastebin_unlock_all.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/games_for_peasants_fireboy_and_watergirl.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/aaruthra_movie_online.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/95418150109.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/81014011687.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/wordpress_twenty_seventeen_child_theme.pdfIn PDF document text
    • https://s3.amazonaws.com/digigitusuduk/97216674373.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/kukokun.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/eustachian_tube_dysfunction_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/cgs_full_form_in_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a335b966-0a06-44b4-9059-aac00848fa8d/nanh2_and_nh3_alkyne.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/pijapubobinaxubep.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA3 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off0000cf97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF97 5260 bytes
SHA-256: 2822e2ef1c4e9a225b48b1411a21b9b712673f896103e6ade50025e5d7edea72
font_02_sfnt_off0000e178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 11148 bytes
SHA-256: 547e2ef01134a26fd084769d881a549f33e3c6b2f3298d942080764c4cb7ed5c

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