Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab5ae0484543d8f…

MALICIOUS

PDF

79.5 KB Created: 2021-03-20 11:17:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 93e1544a67d16bff54a17ca330be8e2e SHA-1: 23b50621edaaee68d18d3cd4f0984ffa31d79301 SHA-256: 2ab5ae0484543d8f738cdad2309a61473694fb72ce98d9e45e6bc509ca9ed50a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://jacksth.ru/wix?keyword=kings+mountain+high+school+graduation+2020 PDF link annotation
    • https://cdn.sqhk.co/baresupujar/ahaUxic/super_pizza_menu_raynham_ma.pdfIn PDF document text
    • http://kafedusoga.iblogger.org/terry_eagleton_what_is_literature_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/jqiaR98/41116713208.pdfIn PDF document text
    • https://cdn.sqhk.co/negolura/Njgfigy/zimsec_history_past_exam_papers.pdfIn PDF document text
    • https://cdn.sqhk.co/sapugelezuf/Dnpzgii/cheat_engine_5._5_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tevotapomow/kxQ2geF/51627627754.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/age_calculator_free_for_android_mobile.pdfIn PDF document text
    • http://gudodatu.rf.gd/lusuzanifoxozu.pdfIn PDF document text
    • http://rovofupokunuda.rf.gd/19159196161.pdfIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_da97de5a64174e44ac4f53fabd376946.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b0def59-8315-4094-9f7d-eb87c077cf1b/woxovev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d19dbbd9-1e3a-40f0-bc23-dc27dfd6a122/acer_xg270hu_review_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf05e6e9-2af6-4b04-a289-dcacc64fe017/worebumafodotelal.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/process_improvement_report_template.pdfIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_3062153fc30a4599aeee39873892d19f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6604a84-0365-4188-8e3e-0cf57afb2030/verbos_regulares_espaol_ejercicios.pdfIn PDF document text
    • http://josegofubusem.epizy.com/10882705838.pdfIn PDF document text
    • http://sudipefenivu.rf.gd/les_auxiliaires_de_modalit_en_anglais.pdfIn PDF document text
    • http://wiwazez.epizy.com/cancer_de_estomago_causas.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_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 5596 bytes
SHA-256: 0f2c8d297ce90ff750a75fcba3fb8001ccb8eee5ad6d5e984e802e50fdc2b93e
font_01_sfnt_off00010a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1C 11452 bytes
SHA-256: b49958eb95e367e1630f0317ee6aa745b747031d86d05021f5f5dfd5c2c4d60b

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