Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a80321c2cbd236…

MALICIOUS

PDF

82.2 KB Created: 2021-04-05 07:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c742a4d04c8b26d6f6845c17c62aeecb SHA-1: 54121904482afaa370297c72295d9e0a40d9a2c2 SHA-256: 97a80321c2cbd236ac0ad32a2ec9fc2a93cd24d02e09ed2bfce82611417cea40
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 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=free+crochet+pattern+for+giant+granny+square+afghan PDF link annotation
    • https://xadamunakufadi.weebly.com/uploads/1/3/3/9/133986396/mefavujo.pdfIn PDF document text
    • https://gimebupezepufo.weebly.com/uploads/1/3/4/5/134507041/5698339.pdfIn PDF document text
    • http://nopuvobetag.mygamesonline.org/abraham_abulafia_libros.pdfIn PDF document text
    • https://malotote.weebly.com/uploads/1/3/4/8/134872882/52cf3.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/f198f5813d.pdfIn PDF document text
    • https://batoxomaziforu.weebly.com/uploads/1/3/4/7/134708014/tosagejasefaju.pdfIn PDF document text
    • https://fexiganariv.weebly.com/uploads/1/3/0/7/130739648/jidurilul.pdfIn PDF document text
    • https://zibataluguxomi.weebly.com/uploads/1/3/1/3/131382491/cf376462a169b.pdfIn PDF document text
    • https://puwedogomep.weebly.com/uploads/1/3/1/3/131382223/nezutoduzak_mubaburenosadab_solefamaxege_sisivimasoze.pdfIn PDF document text
    • https://vafunaparixidi.weebly.com/uploads/1/3/4/6/134627598/rekufelu.pdfIn PDF document text
    • https://gejiraje.weebly.com/uploads/1/3/2/7/132740564/pifefuxiduje.pdfIn PDF document text
    • http://zovolexune.sportsontheweb.net/nclex_pn_questions_and_answers_with_rationale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/38e284bd-4a35-4084-9f4b-cd6e88e7c026/57439570430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f23f13b-9b51-41f9-bf75-94fb32c0d269/quick_and_easy_dinner_meals_for_picky_eaters.pdfIn PDF document text
    • http://bojepudadadax.atwebpages.com/vapifitukidawameridofidog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d525703-0744-4727-b5e5-af3312bf448c/josizujibowuvovezibixov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/528c7cb0-0f70-468d-b79d-95ab0c875d75/game_design_workshop.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/charlie_full_malayalam_movie_in_tamilrockers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7a0738a-cb8e-407b-ad24-2f294bddd3c3/fozaxuzevij.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/dj_acapellas_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce0260c2-6d5c-4ec5-b09c-b8ec8f3d9a01/57506494834.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/zaraderiwinijoj.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/2616428032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7df5cb2-8f5e-41fb-a236-a72bdaa92c84/photoshop_tutorials_advanced.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_off0000ff4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4F 5428 bytes
SHA-256: 976f2c5a0a99a8eb8972df85ae4e930c949ef081d622a671268aef604f660164
font_01_sfnt_off000111d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D1 11808 bytes
SHA-256: 0f21588e004e06b3d775c982f922cafdc20d75c0f45b14a58f997effc2893109