Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffbdd64d515dbf4…

MALICIOUS

PDF

82.8 KB Created: 2021-03-14 20:02:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 93bfe34ed85ec16b0da470522a0f2bd5 SHA-1: b1d7b54e3d9d075d0eda0763f95cf5d493c680f3 SHA-256: 8ffbdd64d515dbf462ae765490b4f69f4d9c5c0cbd5c4002d8d3ab38e7da33a5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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=sample+lab+report+biology+microscope PDF link annotation
    • http://kiwenalod.medianewsonline.com/oil_bunkering_in_nigeria.pdfIn PDF document text
    • http://kimiter.medianewsonline.com/54350794921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370780/normal_60272c728684c.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/60889086452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487382/normal_60400c1c7d353.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gowepuxajotezo.onlinewebshop.net/apj_abdul_kalam_history_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5368fba-1e82-4fb2-8dd9-6226fe64d535/61408233628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f98001a0-ebee-4049-91df-a0730560a86c/business_communication_training_course_outline.pdfIn PDF document text
    • http://likewiwojuxus.atwebpages.com/simbologia_de_diagrama_de_flujo_y_su_significado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58d51a0e-f780-437c-856c-35d166ddc46e/lonely_planet_magazine_india_june_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/gaduzagegizasetesona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f83f21a7-4c03-4b46-ae75-bd5b922ed7a0/california_vehicle_code_parking_citations.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/15921799642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c5d1268-0556-40c4-8793-90964cd79522/16690477767.pdfIn PDF document text
    • http://pigutun.myartsonline.com/associer_deux_page.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/how_to_use_pdp_controller_on_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b178c4f4-144f-4396-8830-9390a7515730/36734149655.pdfIn PDF document text
    • http://rogomore.myartsonline.com/drug_addiction_counseling_techniques.pdfIn PDF document text
    • http://gezixus.myartsonline.com/vermont_castings_resolute_wood_stove_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8348aad-98ff-421c-ba3d-2192c97db826/does_so_good_almond_milk_contain_carrageenan.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/bigegiz.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_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 5600 bytes
SHA-256: 860e60a22dbd06548794358d9580a7b4976de614942b7c2169620f0364d8dda9
font_01_sfnt_off0001160c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160C 11124 bytes
SHA-256: c2981e0a06ac48e31bb887f5868cf5dc7b4949008c0ab688b44c9c151e57fc98

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