Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f009c3b97b75a1…

MALICIOUS

PDF

81.9 KB Created: 2021-04-01 02:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f24e3254da649719232ea7d3239ee339 SHA-1: 1c7698ea109465ed08d9ffea0df7502cef2c6284 SHA-256: 77f009c3b97b75a14bbb1a7069d9ae310b1626e1e7d795f7dad6a9cbec0abe51
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are to unknown or potentially malicious domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=ravpower+filehub+rp-wd01+reset PDF link annotation
    • http://groshyk.site/dell_latitude_d830_hdd_upgradeax95u.pdfIn PDF document text
    • http://topstudy.fun/how_can_i_rap_fast_without_mumbling9hpwa.pdfIn PDF document text
    • http://wiwovurezibaso.getenjoyment.net/57878653276.pdfIn PDF document text
    • http://copyright-supporthelp.com/troy_bilt_storm_2410_how_to_drain_gasmp56z.pdfIn PDF document text
    • http://sait-ok.ru/50818869218se08e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_954afe43c5ae4c40bc98e652ef3ceba2.pdf?index=trueIn PDF document text
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_0e499c5a8e744f08a7153353e9bcc628.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gekojulog/vexenorire.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/24401422703.pdfIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_9f434e9e4f1e4b7fbb598c47080a546c.pdf?index=trueIn PDF document text
    • http://sefowolo.atwebpages.com/92384036136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6577264-974f-4c5a-ad56-1308451fcf42/boy_scout_merit_badges_houston.pdfIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_b071a22e8038483580e800e3bee6e9ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f843650-a79c-444a-86db-5bb8d4538c6b/play_dd_5e_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/escape_from_alcatraz_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/chennai_express_movie_mp4_movies.pdfIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_fd7c4e748cb64265abdb2f51d14054a8.pdf?index=trueIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_9b5608334c8d4203a70df8f95e0ca489.pdf?index=trueIn PDF document text
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_cc695fe6aaae418baa2c3d8669a2ea49.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dde124bd-425f-4e5e-8733-99db98e346c0/how_to_upload_garmin_maps_for_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/alternative_investments_book.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_off000100c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C8 5656 bytes
SHA-256: ed40c9b6ff22b4ee1062e3142f0841197130b67a56c81450a0aba96ea413b5ec
font_01_sfnt_off00011419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 11276 bytes
SHA-256: bdbed0cf1365af8a3986455a2ef504b8b2c99969a44b8a7c4e02347ab2415f9b

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