Malicious PDF — malware analysis report

Static analysis result for SHA-256 33baa1b5be7a2fac…

MALICIOUS

PDF

81.6 KB Created: 2021-03-21 00:13:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: acf0064933afa4e0d43447a9c232290a SHA-1: 2da2ed8c384cffdb4bb8d3ee257df8038937c376 SHA-256: 33baa1b5be7a2fac7f7f81dd01ae868b8790eb1f8cc9ccf037a94bcdac56cb4d
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI that redirects to a suspicious domain, identified as a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the nature of the detected threat suggest it's designed to trick users into downloading further malicious content or visiting a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=software+architecture+in+practice+%25283rd+edition+pdf+%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C+%25D0%25BD%25D0%25B0+%25D1%2580%25D1%2583%25D1%2581%25D1%2581%25D0%25BA%25D0%25BE%25D0%25BC%2529 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374853/normal_601a622d5609f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460048/normal_6000151c21aad.pdfIn PDF document text
    • http://sale50.pro/bimuxofujebajogopujelanuv0iio.pdfIn PDF document text
    • http://ledimpress.biz/dixie_narco_501e_owners_manualz9ndp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491669/normal_5fd793333a4b9.pdfIn PDF document text
    • https://nitogufufuwal.weebly.com/uploads/1/3/3/9/133997090/98908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416923/normal_60215f65a48dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491410/normal_603e93999e3c5.pdfIn PDF document text
    • http://eeuuurrrrr.space/reconstruction_era_policies_timeline_worksheet_answers6vcbm.pdfIn PDF document text
    • http://hurleyshamburgers.com/percy_jackson_and_the_titans_curse_chapter_14k4mnn.pdfIn PDF document text
    • https://pojajowose.weebly.com/uploads/1/3/0/8/130813819/b23d1.pdfIn PDF document text
    • https://vaseviga.weebly.com/uploads/1/3/3/9/133986607/xofotimakilebewise.pdfIn PDF document text
    • http://creditstar-kabinet.com/xukodapojirfj6v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9c3086b9-336b-4a4d-b39c-975a2563a2e0.filesusr.com/ugd/f4f792_158460ae810a4b239706e239e78d8f64.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbb2d589-ab5b-4673-8719-fe0bb5d099bd/what_is_the_significance_of_9_days_after_death.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/422918fe-d424-4046-8722-7dfa6a2a9297/big_little_lies_cast_ziggy_season_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0469b23-ca37-497f-8b2e-a62243ad2b8b/icd_10_code_for_acute_infection_unspecified.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_3a1c7e3f82b445b28d25ec5e1312a560.pdf?index=trueIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_6ba29f0281144c0599d447aa53ae3a52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a71082d9-1949-4c77-8bf1-9f70d5966d3c/61795919878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73037cee-43d5-4f4f-83ce-79de57e45ea1/five_nights_at_freddys_4_full_game_free_download_pc.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_off0000edbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 6664 bytes
SHA-256: 56f72b27690556471dd20a5033b6e6cba866de58a2e52ea3c80fb640429270e3
font_01_sfnt_off000102fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 16360 bytes
SHA-256: dbf0928e52a4f1ca01108b20d9c39c5c36db7e0bfcf8ce8d75b86899dda0668a