Malicious PDF — malware analysis report

Static analysis result for SHA-256 968378f34081d39f…

MALICIOUS

PDF

84.0 KB Created: 2021-05-16 01:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 20a004b59398bfbe489234b0415682a2 SHA-1: acf8d2c42cf1c11e6b87ead3be6e75800b38dcdd SHA-256: 968378f34081d39f76c1636cf8f2d954888caf39fdd82663ac63f0edef2f12e1
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 0.9995

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://xajibur.ru/strik?utm_term=ncaa+division+2+basketball+tournament+2020 PDF link annotation
    • https://kolabobinojojiv.weebly.com/uploads/1/3/4/8/134880551/4759974.pdfIn PDF document text
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/4570099.pdfIn PDF document text
    • https://cdn.sqhk.co/popuzanuguw/9IggddT/mage_defense_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/retesixabe/iiCLgef/93088804828.pdfIn PDF document text
    • https://sufimademum.weebly.com/uploads/1/3/4/2/134236216/vifibizebarom-nabifakumitabu-linim.pdfIn PDF document text
    • https://rigitugatelimo.weebly.com/uploads/1/3/4/1/134131632/0aa9d49e1.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/f0XSwhj/the_buzzer_radio.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzufoxo/bvmgen6/15093498904.pdfIn PDF document text
    • https://duluvozega.weebly.com/uploads/1/3/5/3/135327827/bejanar-kanupusixi-wumijuz-futusitaxit.pdfIn PDF document text
    • https://judetali.weebly.com/uploads/1/3/4/7/134723341/3200409.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
    • https://uploads.strikinglycdn.com/files/b862ab08-2ce8-4629-940c-7c017dca2118/64954436978.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/social_anarchism_or_lifestyle_anarchism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3bda341-cd01-483c-b05b-d5b4c130a601/become_what_you_are_alan_watts_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/waiting_for_godot_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/vudetotisuram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/179b2f8c-87a0-4268-84f0-f9b375a0c739/54090852126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cc984a2-e95c-49f4-afbe-0c9a7afb33c6/how_much_does_it_cost_to_join_delta_sigma_theta_alumnae_chapter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94f474ea-b592-4fb2-b951-13e061037bbe/tom_clancys_jack_ryan_review_guardian.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/speak_book_discussion_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62b0a5fe-54fb-40be-8044-47623541edeb/par_quoi_remplacer_le_beurre_de_cacao_en_cosmtique.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8754036a-7029-4082-a379-caa23fa6104d/57771781393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81cfd1fb-109c-4dd6-880f-7a1806012e5d/demujijiwudobuwavifigad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF9 5472 bytes
SHA-256: 6b0383456e8959ab83724ac609b30b16f04f051e321b8a88218098c507c1b764
font_01_sfnt_off00010e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7F 11104 bytes
SHA-256: c34e40c4001f574d1f8deff85441108d47bc1aaafbaa9125966ef924a6175c1d
font_02_sfnt_off00013471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13471 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e