Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9643bbedb789e64…

MALICIOUS

PDF

92.0 KB Created: 2021-03-18 17:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6677abb39be8701ffa46e9d3c44a26ab SHA-1: d978f129964c8bd40521e3fabaf37021cb9997b8 SHA-256: e9643bbedb789e642dad50f0c060621a862de44c96b83a2372574f996f5eaa3a
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, identified as a link farm, with several pointing to disposable hosting. The document body, though heavily obfuscated, contains metadata suggesting it is a 'marketing research thesis pdf' generated by wkhtmltopdf, which is a common lure. The presence of PDF_URI and PDF_SEO_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/award?keyword=marketing+research+thesis+pdf PDF link annotation
    • http://reactivaperu-viabcpi.com/best_starting_class_eso_2020e6avf.pdfIn PDF document text
    • http://jopagozopive.medianewsonline.com/types_of_metal_cutting_tools.pdfIn PDF document text
    • http://sasegotib.medianewsonline.com/epidemiological_study_designs.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/notuki.pdfIn PDF document text
    • http://silvanozito.online/86936348028ree1d.pdfIn PDF document text
    • https://movabeze.weebly.com/uploads/1/3/0/8/130814110/4732767.pdfIn PDF document text
    • https://xefakiradu.weebly.com/uploads/1/3/1/8/131856624/f3c992.pdfIn PDF document text
    • https://penaxixix.weebly.com/uploads/1/3/0/8/130813526/lajenefomigivoxil.pdfIn PDF document text
    • https://nidapekosoko.weebly.com/uploads/1/3/2/7/132740606/duzarivi-zuvaguravopura-dupukakawov.pdfIn PDF document text
    • http://operationhomeplate.com/what_are_other_words_for_multiplyk6r4j.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/7d20a2a5-6a93-419d-b128-e55cce8fcf25/15728288259.pdfIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_cca3d30b86fc40f7ad05f021d1f3bc15.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e827cd3-0027-47dc-91d5-1440d38605cf/power_holdem_strategy_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00673958-7608-4cb0-9113-19f97ecc89b6/10106741754.pdfIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_2868eee5b4cb4e6586a508e5a28d9f8b.pdf?index=trueIn PDF document text
    • http://belibivizonojo.myartsonline.com/81724667624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72ce75d8-c628-4a22-98fd-634cad20943c/jexikitizimase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34c69816-e785-45a5-947c-f80c20e97572/how_to_program_honeywell_focuspro_5000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/964d7d9d-fd8f-4862-892a-7f2871cf6a3f/black_and_decker_cordless_jigsaw_with_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de6c2d71-72e0-4a86-86e5-1328f1ca1fee/love_story_song_lyrics_punjabi.pdfIn PDF document text
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_4b531622f10344a68a41e2a0f200d3b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f893924-ae03-4862-9e25-dcfd48a2519f/konomofogola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/109c6d99-a13b-468a-b02f-867c78aa8376/14060301575.pdfIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_19eaf5f1bb044fcf9922e2133adc19d2.pdf?index=trueIn 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_off00012aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAA 5456 bytes
SHA-256: 4966b7b92a9b54bad6b8a40479f78dac65a4b028be25b104922900e68bfe5b8f
font_01_sfnt_off00013d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D46 10984 bytes
SHA-256: 9ae4f1f1af04911b90014c07274dc005a12f573f3a4d95fa6679f6dd6754f6c1

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