Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f5818e7073be61…

MALICIOUS

PDF

122.5 KB Created: 2021-03-24 10:16:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: efca829b2d26d69866e63e53d4c8e512 SHA-1: 91b5acf0da68d07f846b95e190f8e06f51270dea SHA-256: 82f5818e7073be611384f602c238c40096ac485892025eb50c52512520fc2fe7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://pelibifir.ru/123?utm_term=dragon%2527+s+crown+pro+trophy+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451021/normal_5ffbfa251c2e5.pdfIn PDF document text
    • http://itabody.space/aadat_hai_teri_ya_tera_ringtonecex9n.pdfIn PDF document text
    • http://boost-shop.xyz/587539768645fdu2.pdfIn PDF document text
    • http://meblik.su/dichotomous_key_worksheetkvw12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454429/normal_6004a9dc9308d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392862/normal_6038793180f16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_604fcb9c3fcbe.pdfIn PDF document text
    • http://fizasibako.22web.org/independent_contractor_agreement_template_free.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/ncert_chemistry_book_class_12.pdfIn PDF document text
    • http://shop50off.info/minecraft_mod_hexxit_1.12_2_download6gf8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421341/normal_5fc613a6ac7dc.pdfIn PDF document text
    • http://geosen.net/29432864941ow9is.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fewilux.rf.gd/estimation_and_costing_download.pdfIn PDF document text
    • http://finabupotokuko.epizy.com/breakfast_at_tiffanys_lyrics_ariana.pdfIn PDF document text
    • http://xugemogi.epizy.com/6.0_powerstroke_engine_oil_spec.pdfIn PDF document text
    • http://lagamifex.epizy.com/phylum_rotifera.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/vizio_e470i-a0_remote_control.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/21457787966.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/cheers_crossword_answer.pdfIn PDF document text
    • http://fidalanono.myartsonline.com/victime_bourreau_ou_sauveur_comment_sortir_du_pige.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_off0001a224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A224 5528 bytes
SHA-256: 31a8375903f444ab59b202db1b8da5ba99434acebf2843bf2cecfd9ce0cd7d23
font_01_sfnt_off0001b512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B512 11360 bytes
SHA-256: cd4194340f9bcb0354282e7f4cfba843005e9313b6956896759cbc9c4aac36e4