Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b511e6dc9c4935…

MALICIOUS

PDF

68.9 KB Created: 2021-01-19 21:48:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a7a18b395033febdf156fefb910fec89 SHA-1: 71b390fee1915fd4b3a9a9a43b0c312b958ae864 SHA-256: 40b511e6dc9c4935d8809d4654ae50555d4af2125ccdf9612a2d93c6686c93d6
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting or known redirectors, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains references to 'instruction manuals' and 'wkhtmltopdf', which are likely lures to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=maytag+instruction+manuals In PDF document text
    • https://napifilimikap.weebly.com/uploads/1/3/1/6/131606974/3422501.pdfIn PDF document text
    • https://cdn.sqhk.co/tejurorado/hijiifP/kometumuzo.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/YzgiZib/vh1_rupaul_all_stars_season_3.pdfIn PDF document text
    • https://site-1174986.mozfiles.com/files/1174986/starfish_manor_hotel_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/wukikanas/Igjjaia/beteregumajikuzisavaf.pdfIn PDF document text
    • https://fivilogavizizov.weebly.com/uploads/1/3/4/4/134446089/gomimatazi_vutoruvo.pdfIn PDF document text
    • http://zomuregunaradu.iblogger.org/aflatoon_full_movie_hd_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/uwXGshj/biters._io_unblocked_games_66.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/iUrihCP/pizaburuxitivoletikupopej.pdfIn PDF document text
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/4552138.pdfIn PDF document text
    • https://site-1194081.mozfiles.com/files/1194081/zasipij.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/ggjagjS/wolivododitasado.pdfIn PDF document text
    • https://zekulereloto.weebly.com/uploads/1/3/2/7/132710655/8148537.pdfIn PDF document text
    • https://jositaloj.weebly.com/uploads/1/3/4/0/134042718/7945130.pdfIn PDF document text
    • https://cdn.sqhk.co/miwataxanis/efjeLjk/1844917759.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://texazufuvo.rf.gd/wusadavukugefakopuboboje.pdfIn PDF document text
    • http://sukowinom.rf.gd/high_resolution_chalkboard_background.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_off0000ced9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED9 5228 bytes
SHA-256: 61fc87dff3dd996075ce68c9d358a44982246d5489cbfc6c7384c2f68ed94f72
font_01_sfnt_off0000e0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 11276 bytes
SHA-256: a639ee9ce69c05aafec7255a76fcc6053245d0439fe1d3b11b266f7e777b24bc

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