Malicious PDF — malware analysis report

Static analysis result for SHA-256 8815aacbfe002334…

MALICIOUS

PDF

77.0 KB Created: 2021-05-12 11:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f214cd690bd964e3dfde40f428199abd SHA-1: 2577f11a142298194005ec2b67e71e7ec86d04cb SHA-256: 8815aacbfe0023346160f780ddb6b9b18169f58056026940e5cd923bb14f4b8e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to redirect users to a large number of potentially malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=astatic+pdc1+instructions PDF link annotation
    • http://tekplafond.xyz/5091152279482xju.pdfIn PDF document text
    • http://rabemedexisubis.mygamesonline.org/31165982965.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/gjbdghm/bigfm_radio_stream_url.pdfIn PDF document text
    • http://xufuzema.sportsontheweb.net/cash_book_in_tally_erp_9.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/nipejifitazigasukiz.pdfIn PDF document text
    • https://cdn.sqhk.co/lalivaga/YhjPBji/nusajazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445877/normal_605a2268ded3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407070/normal_604b18ba0b5c0.pdfIn PDF document text
    • http://xtreme-sport.ru/crochet_patterns_for_easy_hats7qi92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479214/normal_5fc7b8185c0a8.pdfIn PDF document text
    • http://geloritiveda.mygamesonline.org/86590457464.pdfIn PDF document text
    • https://cdn.sqhk.co/bawevabob/Ck1m0jj/tujifowirudipizopinuje.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/cxhgCll/dabipewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378621/normal_60345ce392305.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366381/normal_5ff9fd452979c.pdfIn PDF document text
    • http://instapriz.site/saeco_espresso_machine_repairw99la.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383930/normal_60634566c4aa6.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/rekawexuretowo/pokemon_battle_revolution_2_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/dafifupogosunesudifufe.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/canon_software_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/27064937523.pdfIn PDF document text
    • http://dapekafuxururo.myartsonline.com/libro_de_interpretacion_de_los_sueos_cristianos.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_off0000eeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 5076 bytes
SHA-256: 9bfce7b294dcd0b1a9ec42ec7bd5dc319e3b44e2286c86be45eaade9fabd1bf4
font_01_sfnt_off0001000c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000C 11384 bytes
SHA-256: 6ecf61d35273ad63bd43bfab91341d67f28af210ee59953b6d86c6a5e7ebba61

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