Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08c0be9e79e5f16…

MALICIOUS

PDF

75.0 KB Created: 2021-03-02 16:27:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5f07f7a31c636b2d115e64d7e8f27165 SHA-1: 59d96cee7295120a437cc1194dd4c274eb502a8e SHA-256: b08c0be9e79e5f16e9d52caca2c6a8ea528ba4151e2ebfbddc821944d25ad352
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to distribute SEO-optimized content. It contains numerous external links pointing to disposable hosting services, suggesting an attempt to redirect users to potentially harmful sites. The document's structure and the presence of external links indicate a likely initial access vector via spearphishing attachment, aiming to lead users into a malicious ecosystem.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://midufefew.ru/wix?keyword=large+oval+ceiling+medallions PDF link annotation
    • https://divojalu.weebly.com/uploads/1/3/4/6/134664609/pogapopenijuveb.pdfIn PDF document text
    • https://cdn.sqhk.co/duwutawuna/riaYbid/firusipozejogudeji.pdfIn PDF document text
    • https://cdn.sqhk.co/wefegiwezon/kgffxge/change_eye_color_app_online.pdfIn PDF document text
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/zividularul_zanutamojoporud.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/pathfinder_character_sheet_fillable.pdfIn PDF document text
    • http://dajexori.mypressonline.com/garmin_drivesmart_55_ex_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473622/normal_60018d6bd7d1c.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/geibQCD/72841597897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470837/normal_601b7c4d3d520.pdfIn PDF document text
    • https://cdn.sqhk.co/kupovite/smgiphd/gevogisewuve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500425/normal_603bb9fb2271b.pdfIn PDF document text
    • https://cdn.sqhk.co/mitejapeki/OH8ajdx/pak_chat_rooms_free_online.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/51690725494.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/JLfifgj/energy_joensuu_instagram.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/77766266218.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/eifEgfU/chand_sifarish_jo_karta_hamari_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/jihhXji/honda_amaze_lunar_silver_colour_images.pdfIn PDF document text
    • https://jabakatuni.weebly.com/uploads/1/3/1/0/131071057/julejasif-jedatubo-sinokixaliwise.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F9 5260 bytes
SHA-256: 8f4a9a6e24a6c141ee53a137b76fcc18c3ad8964441faab829b980de980083b1
font_01_sfnt_off0000e3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 11052 bytes
SHA-256: 66db938526b9a5028362fa854d5d19266362f8baf7f51c9c9979e458c6665c0f
font_02_sfnt_off00010997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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