Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8e5f63a4f5e52a…

MALICIOUS

PDF

133.6 KB Created: 2021-03-20 20:45:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 817a0ba82242bbbfe0a592e22088dbd4 SHA-1: 528582917c4f752f09bd349150dbdec645ebc17b SHA-256: cf8e5f63a4f5e52a7b7d2002e447a4ed9145ba4005395941e2bfa4f92bb3db62
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors or disposable hosting. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to phishing or malware-hosting sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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 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://crophysi.ru/award?keyword=oxidative+phosphorylation+biochemistry+pdf In PDF document text
    • http://rixivuk.iblogger.org/lg_inverter_direct_drive_washer_top_loader_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/nukunudakiju/hghMjaO/29130505250.pdfIn PDF document text
    • http://nowofuguvinidaw.iblogger.org/corrugated_bitumen_sheet_fitting.pdfIn PDF document text
    • https://cdn.sqhk.co/xukigipeduve/gih6Rgg/58492807603.pdfIn PDF document text
    • http://betaxosenomagu.iblogger.org/jinja_template_python_variable.pdfIn PDF document text
    • https://nabisomo.weebly.com/uploads/1/3/5/9/135993280/6347463.pdfIn PDF document text
    • https://cdn.sqhk.co/nemalerute/dhfN8ji/performing_rights_organization_bmi.pdfIn PDF document text
    • http://matizaw.mywebcommunity.org/divine_mercy_chaplet_rosary_youtube.pdfIn PDF document text
    • https://xajakubadom.weebly.com/uploads/1/3/0/8/130874473/c5827d.pdfIn PDF document text
    • https://cdn.sqhk.co/domuduxuro/jihjhjf/the_diplomat_milwaukee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ripapekum.epizy.com/ligitonisabife.pdfIn PDF document text
    • http://jowawaba.atwebpages.com/the_crc_encyclopedia_of_mathematics_third_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/nidowagazimiposorofewuz.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/stihl_ts_420_user_manual.pdfIn PDF document text
    • http://vutikasozimot.epizy.com/how_to_use_simplisafe_key_fob_as_panic_button.pdfIn PDF document text
    • http://kutezowifemiwe.epizy.com/40809963880.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/what_is_the_difference_between_bosch_300_500_and_800_series_dishwashers.pdfIn PDF document text
    • http://rewezusemiruzo.epizy.com/3219449212.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2C1 5792 bytes
SHA-256: 6a76c701e8c785e3d46ef3c362fbc2c0c39f6077cff06233beeada55565cd5ea
font_01_sfnt_off0001c655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C655 13688 bytes
SHA-256: c609ad4ab8880cfd81ced69859020768665e368778f8b4476ee11fccdadcda38
font_02_sfnt_off0001f30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F30D 16168 bytes
SHA-256: 80e30d34f3d3279229b0ba92537a2212c02818f5c50d25fdf6ed03445d54b617

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