Malicious PDF — malware analysis report

Static analysis result for SHA-256 c669ecbdd713b928…

MALICIOUS

PDF

76.2 KB Created: 2021-03-29 03:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7279918e64a8cd3ca60d1fd5a9447ed1 SHA-1: 18c44bcf76708488f5c6df624d04330e28de6978 SHA-256: c669ecbdd713b928f187f5cc820e0e8a9d7d38197319f99634956ad1c888b118
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links, many of which point to disposable hosting services. The primary URL, "https://vilenefex.ru/award?keyword=bucket+elevator+design+pdf", suggests a lure for search engine optimization, likely intended to drive traffic to malicious or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://vilenefex.ru/award?keyword=bucket+elevator+design+pdf PDF link annotation
    • https://senidexug.weebly.com/uploads/1/3/0/7/130775540/7109645.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CFgdiND/wobokosomapodotiw.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/hgjfEja/pdf_annotator_free_portable.pdfIn PDF document text
    • http://familyit.info/acid_and_base_worksheet_grade_76r66t.pdfIn PDF document text
    • https://kisuwirabavaruz.weebly.com/uploads/1/3/3/9/133999170/10615.pdfIn PDF document text
    • https://gazutegib.weebly.com/uploads/1/3/5/4/135400758/kezozuguda.pdfIn PDF document text
    • https://tusilagel.weebly.com/uploads/1/3/0/7/130739454/5ff96c74.pdfIn PDF document text
    • http://kino-vezde.ru/ok_jaanu_full_movie_download_filmywaz4v3n.pdfIn PDF document text
    • https://galinigogazefu.weebly.com/uploads/1/3/2/6/132695851/9641990.pdfIn PDF document text
    • http://newser.site/immigration_nation_netflix_documentary3abn2.pdfIn PDF document text
    • https://cdn.sqhk.co/pejemomet/jhdQYgg/cheat_code_for_word_cookies_game.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/igjichb/reapers_revenge_hours.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_c124a5d398244db891fa48adcfd26e43.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_56e0ca5f1153477ea912f36658ba5a2a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xujitezu/84591059070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c54dab55-1894-4a2b-9871-ce87adfd93ca/tikubenimukoluzuxogiri.pdfIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_f90a5e3a8f524fc3bef78021d0f98d65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bifamomove/furmark_64_bit_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/lopifuzaxadirutipol.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/satotivilavoxabupir.pdfIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_f358bfad63ce40aa8bf2c8d7de6bff5f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e6d968f-ac66-4769-a67b-b05829de3415/which_of_the_following_would_behave_as_a_weak_electrolyte_in_water.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_off0000ece6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE6 5496 bytes
SHA-256: 2960cc24795b6d799776001f80cf659bd757170edd1c13df52e3f82201879585
font_01_sfnt_off0000ffb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB6 10604 bytes
SHA-256: b48190d54ff2f02f1d5fe216fafc83777660fe55011d1e89e43b1c5662f0d90f