Malicious PDF — malware analysis report

Static analysis result for SHA-256 3898047e4671aa1a…

MALICIOUS

PDF

75.7 KB Created: 2021-02-22 02:50:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 63dd86aa64234e10fd0028a99488c358 SHA-1: b80995455dc67abbd136c8e4aa03801d47d6906f SHA-256: 3898047e4671aa1af8d774d799b39e62a0977e839703b060143d81cf0af9301a
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to manipulate search engine results or redirect users to malicious sites. The document's content is a lure, using a search query as a pretext to host these links. While no scripts were extracted, the PDF structure and numerous external links are indicative of a phishing or redirection campaign.

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://baarspo.ru/strik?utm_term=how+long+is+all+8+harry+potter+movies PDF link annotation
    • https://rubebukani.weebly.com/uploads/1/3/0/7/130740450/kejilididavobeva.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/149476.pdfIn PDF document text
    • http://yogist.fun/344602967i1d6a.pdfIn PDF document text
    • https://cdn.sqhk.co/xogixute/AFghi9G/wapawutazumatuzival.pdfIn PDF document text
    • https://cdn.sqhk.co/bugabowozi/jgeVgit/infinite_car_racer.pdfIn PDF document text
    • https://cdn.sqhk.co/bapinero/dibAucc/zopororunukibaduluz.pdfIn PDF document text
    • https://cdn.sqhk.co/lokabawopup/hcifOgd/tmnt_portal_power_pc_review.pdfIn PDF document text
    • http://usacreditmonitoring.info/65375821101u3dge.pdfIn PDF document text
    • https://cdn.sqhk.co/pubisifibuj/idGjgTG/21824027360.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/dUjhhcw/funny_guys_are_dangerous_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/jedepazisu/ejbjchc/craigslist_new_jersey_for_sale_by_owner.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/EKA5ifE/gods_of_arena_game_mod_apk.pdfIn PDF document text
    • http://pekibule.iblogger.org/black_law_dictionary_8th_edition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lepajavawis.epizy.com/judy_moody_saves_the_world_worksheets.pdfIn PDF document text
    • http://vutilunero.rf.gd/64049773786.pdfIn PDF document text
    • http://xexojonorowo.epizy.com/chita_tera_chola_song.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_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 5644 bytes
SHA-256: 03dfd3bec4b0f641e775c8fd217428aad9284d0326203a5591377a96ecba74be
font_01_sfnt_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 10520 bytes
SHA-256: ad51c888c8d32977e89f0b86134e0c55c046535cf7a8cccf857b4848f326cdf4

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