Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7a83c537cf1218…

MALICIOUS

PDF

78.9 KB Created: 2021-03-17 01:02:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5cfa769998ff01bbb808aef692b1e9bf SHA-1: 515392d6422f03ade1f11fd6edc7958eb4aa2761 SHA-256: bb7a83c537cf1218ec6e01fd18fa6d07c3b58d97133c3bcd2ff197b0d687650f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/award?keyword=ecological+diversity+pdf PDF link annotation
    • http://lnstagramverifiedsbadgeform.com/translation_french_english-french_dictionary_reverso_collins0cw98.pdfIn PDF document text
    • https://lusebedadejaxid.weebly.com/uploads/1/3/1/4/131407110/9870940.pdfIn PDF document text
    • http://euroshopmn.space/android_version_9_devices8ho5d.pdfIn PDF document text
    • https://gapetomoje.weebly.com/uploads/1/3/2/8/132816106/deditod.pdfIn PDF document text
    • http://serikanipesemo.iblogger.org/soul_music_blogspot.pdfIn PDF document text
    • http://blognews.top/xajekinasuwuzib62ki.pdfIn PDF document text
    • https://wipigoxexidon.weebly.com/uploads/1/3/2/6/132682030/8250748b6.pdfIn PDF document text
    • https://derajuxojop.weebly.com/uploads/1/3/1/4/131452827/6267141.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/b148e9b4-b353-4b92-9e1a-82fd7a3693f1/what_weight_is_aw32.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97c5755c-5794-4ee1-b6b7-39898e8c6d91/core_java_for_the_impatient_exercise_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5988dbbb-fa75-4dab-8f58-0997f79e1f6e/jerujegogisira.pdfIn PDF document text
    • http://noderisaxe.rf.gd/wudarusagojuxalupodi.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/highway_to_heaven_season_1_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/gugexotezusujevino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8adfed8-4703-4411-aa3c-362de33b0e3a/carbs_in_a_taco_bell_bean_and_cheese_burrito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/994cce72-19d0-43cb-a07d-6bbf002accf3/addictive_drums_2_custom_review.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/android_emulator_network_redirection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5907bbab-7b48-4bf1-bd4c-ac9b87806235/nugudukodogutosugarekimex.pdfIn PDF document text
    • http://kiburomuwilun.epizy.com/27261529640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d4b5f33-9781-48a4-a081-5fc8f9bf9784/craftsman_2500_psi_pressure_washer_pump_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b772f69f-9439-4436-806f-18315ae95107/manual_de_organizacion_de_escuela_primaria.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_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 5440 bytes
SHA-256: 6f413c11b763dd4140419629df25ad3c9d5bf5672d66e260bd9a553a45be2d4f
font_01_sfnt_off0001089b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089B 10976 bytes
SHA-256: df97a0f153b7e914ba245633b6ff7781fa8491db0b1797691ada9e0a450a0063