Malicious PDF — malware analysis report

Static analysis result for SHA-256 de19ed3d8b75b373…

MALICIOUS

PDF

83.7 KB Created: 2021-03-05 04:44:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f986711ec4795957f72974cb330b09f7 SHA-1: 714607a4d224ffd28430f474b47de9a1b7fa7120 SHA-256: de19ed3d8b75b3738e5184f22cb742b958a76f748008d780bdab8ee5e0de6207
186 Risk Score

Malware Insights

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

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 0.9887

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://soxebez.ru/strik?utm_term=fly+tying+materials+sale PDF link annotation
    • https://cdn.sqhk.co/tivinarafuvu/RuXggNU/nepojadojeziromav.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/77557076525.pdfIn PDF document text
    • http://jovefupe.mywebcommunity.org/76452443619.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/metric_system_conversions_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/ih1haee/4206946683.pdfIn PDF document text
    • http://tijukilebag.getenjoyment.net/how_much_does_d_and_c_cost_in_nigeria.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/42458675425.pdfIn PDF document text
    • https://cdn.sqhk.co/faroziwe/3Z2ge69/mixebakoporekejojad.pdfIn PDF document text
    • https://cdn.sqhk.co/kozosorole/Pgigcgc/divewegute.pdfIn PDF document text
    • https://cdn.sqhk.co/bagojenul/dOtgkhg/40764859717.pdfIn PDF document text
    • https://cdn.sqhk.co/janogoxuke/jdggCFW/motorcycle_wallpaper_hd_4k.pdfIn PDF document text
    • http://lozomaneje.getenjoyment.net/free_self_esteem_worksheets_for_adults.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/how_to_clean_melt_burner.pdfIn PDF document text
    • https://cdn.sqhk.co/xatijafuwami/eggkggs/classroom_management_theories.pdfIn PDF document text
    • http://tideparipawovu.mygamesonline.org/listening_english_grammar_lessons.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/dmhjjie/wufub.pdfIn PDF document text
    • http://dodajavux.scienceontheweb.net/game_of_thrones_books_reading_age.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tiluxusimutine.atwebpages.com/seven_years_old_song_mp3.pdfIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_18e97c238d954ec9a76a2363aa3ebd06.pdf?index=trueIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_081ba0bc4618481c8b7a3c2321699c9e.pdf?index=trueIn PDF document text
    • http://vekejuf.atwebpages.com/jodofibasilizafo.pdfIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_b5fefc5720004e8190584a2388a74c2a.pdf?index=trueIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_abf674b48705475c90942b24d706cd82.pdf?index=trueIn PDF document text
    • http://nejesezape.myartsonline.com/98901244854.pdfIn PDF document text
    • http://rexefobixavater.myartsonline.com/30012257037.pdfIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_22574d0c3c484a1dbbf35e05c1690e56.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000116d9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x116D9 17908 bytes
SHA-256: 0e3f0c36a9a658283553db1fa036711277d255057ebb44639dc16c9a786f1375
font_00_sfnt_off0000e342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE342 4740 bytes
SHA-256: ef96a41a0809245aef9e4733008a1904fe97c20bc593e466ca058ca59d15073c
font_01_sfnt_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 10388 bytes
SHA-256: 61da7e0d8739b7e2b47727329627283f3a3dea4340052df4a5db9644f47c186f
font_03_sfnt_off0001328b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c