Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8c9531aaeca25b…

MALICIOUS

PDF

85.6 KB Created: 2021-03-18 19:05:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 537f040404f5230b18db21de91bc6dee SHA-1: b0c21678ef6171bf207d5269d04a36cc6612c926 SHA-256: 9f8c9531aaeca25bba9e564aa92e7d59d00a6d63536ad2faee73cfdcd5f86aa1
184 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with at least one pointing to a known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to academic papers, aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=an+introduction+to+sociolinguistics+by+ronald+wardhaugh+pdf In PDF document text
    • http://tibojokotetus.iblogger.org/giraxefitotir.pdfIn PDF document text
    • http://zawimumerefop.iblogger.org/nerez.pdfIn PDF document text
    • https://zexuboru.weebly.com/uploads/1/3/2/6/132683252/semuwomagusemino.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/881856.pdfIn PDF document text
    • http://rawokixe.22web.org/how_to_replace_battery_in_uniden_cordless_phone.pdfIn PDF document text
    • https://nuguviroguzemek.weebly.com/uploads/1/3/1/0/131070089/lediv.pdfIn PDF document text
    • https://komanogorolelew.weebly.com/uploads/1/3/1/3/131380356/jajijavelojexabokoti.pdfIn PDF document text
    • http://masuxolujetub.22web.org/flowchart_template_office.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/zafaronivaj/piriformis_syndrome_pt_exercises.pdfIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_c4ac9ebb41264eb2bf260610fb98fa8f.pdf?index=trueIn PDF document text
    • http://verejixufitoge.rf.gd/decodificador_orange_tv_powered_by_android_tv.pdfIn PDF document text
    • http://lilaxeluven.epizy.com/etiologia_de_la_enfermedad_periodontal.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_71fb8d93dffc42fabab91d9711eb6ca4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faxaxos/who_all_dies_in_pet_sematary_2019.pdfIn PDF document text
    • http://bubexixan.epizy.com/marginal_distribution_joint.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/29401953469.pdfIn PDF document text
    • http://sifebina.epizy.com/sap_basis_admin.pdfIn PDF document text
    • http://jemejuzot.epizy.com/xowuli.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/are_rotating_waffle_makers_better.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/tajizisizugun.pdfIn PDF document text
    • http://fopevuvowixapa.epizy.com/casablanca_tourist_guide.pdfIn PDF document text
    • http://vedezaduxi.epizy.com/garden_answer_wiki.pdfIn PDF document text
    • http://zogirifo.epizy.com/how_to_fix_midea_washing_machine.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_off00010dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD1 5740 bytes
SHA-256: 069ccf828e108960ab2e10aae1a4ff65b406a025caa912b971fbe068bbb5acc8
font_01_sfnt_off0001216e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216E 11388 bytes
SHA-256: 9d4ea7e0eb736dcb0bd5edbb33beccbb3d3ec93957258c1586eb7eb36aa153e8

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