Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d856b57f7c440c6…

MALICIOUS

PDF

72.1 KB Created: 2021-03-07 01:47:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b9a2bc7aed78f970793040cc13ae1254 SHA-1: 53c36a824344b7ec993f82040c43e5d52d4f2a88 SHA-256: 7d856b57f7c440c6cc768d4b65d9e075e06642a5af21b860a8a2512f0223b27c
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 0.9996

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://jumiwimov.ru/strik?utm_term=toshiba+satellite+l755d-s5106+battery PDF link annotation
    • http://zefabafiw.22web.org/wajinamini.pdfIn PDF document text
    • https://tekoriforeta.weebly.com/uploads/1/3/4/6/134639422/8556de80d.pdfIn PDF document text
    • https://tavadarikozo.weebly.com/uploads/1/3/5/9/135987174/rufevudalujuv_fatavebamejida_kawudoton_zekezijitej.pdfIn PDF document text
    • http://wirodapupoz.iblogger.org/hafele_catalogue.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://beritoka.rf.gd/accounting_equation_exercises.pdfIn PDF document text
    • http://pepitikisuv.rf.gd/9269653684.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/greatest_weakness_answer_to_interview_question.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/61755566473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56974629-00a3-449c-ad46-ad65b49c4366/99513450278.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/fefevowilibujerirubis.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/aatma_movie_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ca8dd9c-f152-4464-a28d-f79e50a3adc0/what_sauce_is_on_burger_king_breakfast_burrito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbc1ec78-3138-4628-b55b-39256541cf14/vampire_hunter_class_5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5f88cfb-8005-44a5-b161-880cf24f5956/demijuxopafo.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/48012082104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a23e72-8b9c-4662-aaa3-5d6b5bdea5f8/buguna.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/sportspower_mountain_view_metal_swing_slide_and_trampoline_set_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a20cb3b-96c1-46ac-9a14-cc6584e4076d/38674904540.pdfIn PDF document text
    • http://jajoxutevo.epizy.com/34955741525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1767c615-2389-4c74-8829-c059020cee6d/how_to_winterize_a_mercury_optimax_225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f034cba-5494-4ade-9c17-bbf99b0707a7/how_to_learn_technical_writing_skills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e965822-1a6b-4423-a597-68eb3eba5f94/nomamexejenevedefisaxot.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_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 5688 bytes
SHA-256: 2039fdd4dc5f3ae2ba73c30bf52b8c9bc309cd912e3be926beb684386a9020af
font_01_sfnt_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 11320 bytes
SHA-256: db9035314aac3fb9fb0d49795cc5aae0bbf707bc60ac702db4dc0883de26d866