Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a59f7fa21b24327…

MALICIOUS

PDF

85.7 KB Created: 2021-03-17 16:08:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e6d6bd076840cc9d293a8c327cfb4deb SHA-1: 228bb193a84616fc066ca2431bd6274ebf38e896 SHA-256: 7a59f7fa21b2432735c7f0231054be19cfcf51c374e3a091962d1aedf2a95c25
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The ML classifier and ClamAV also flagged this file as malicious. The embedded URLs suggest an attempt to direct users to potentially harmful sites, likely for phishing or SEO spam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=stoichiometry+lab+answers+key In PDF document text
    • http://strita.space/example_of_addition_reactionfnbtf.pdfIn PDF document text
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/6bdc233b.pdfIn PDF document text
    • http://13millions-warzone.store/xuvazi0vayh.pdfIn PDF document text
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/fadunatev.pdfIn PDF document text
    • http://filanion.online/zekotelijigomevkaumv.pdfIn PDF document text
    • https://suxamoka.weebly.com/uploads/1/3/4/8/134876373/1177688.pdfIn PDF document text
    • http://rerubin.space/rikazeluropatuwekuxokrkq4.pdfIn PDF document text
    • http://hisgohar.site/how_to_connect_pioneer_bluetooth_headphones_to_phonedmfwa.pdfIn PDF document text
    • http://epaytds.xyz/novumenetewugagibibifv77h1.pdfIn PDF document text
    • http://blancer.xyz/missguided_returns_after_14_dayszb5nd.pdfIn PDF document text
    • http://insuranceautousa.com/swift_action_sheet_custom_viewqe73b.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/paropabaru/nebutasujolupan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b55efd-19b6-45c6-ae20-8c1c52101c7a/how_to_run_visual_basic_program_from_command_prompt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f81e3b2c-468f-45c9-a7e6-bf9de685179b/58428135530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4263171-a6e7-4b50-befe-8787cb729b81/sabazupavanugovediz.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/kojujelinuxinuzolupopome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cd5c6de-b182-49e0-8333-712d4595fe30/sears_lawn_mower_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52281272-7029-4e3b-ab65-00b8f2e4ad5b/lecturas_del_domingo_xxvii_del_tiempo_ordinario_ciclo_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1a2e21-aa27-4700-9ff0-599fd2e447cc/49764242296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/443e53b8-9ff8-45dd-afa9-c655657bef46/sutiwofokujubip.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001055d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 2948 bytes
SHA-256: 6193ae5e1ba9309bf1242d6e0a406601078bce13db99ffdf9b0cff6bbb146ce8
font_01_sfnt_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 5540 bytes
SHA-256: 931ff35cbfd0c70bfc6f556c4f2f4ce2ccb5bba80af9d22a35b51b4cb933efcf
font_02_sfnt_off000122a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A3 11392 bytes
SHA-256: 51cfc1294ade2c95874d427b418c14bddbcf14d50e8b649cc503ae4e21e0dd05