Malicious PDF — malware analysis report

Static analysis result for SHA-256 845617a9ab91704e…

MALICIOUS

PDF

78.8 KB Created: 2021-03-10 19:36:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c4d048cd6aafecd6b54981b850276269 SHA-1: d3e8be1fc8063b896c646430203ed3b5e294d64e SHA-256: 845617a9ab91704edeefd2774478d26bb3e19cd72d43c3dc93b353b257327596
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crophysi.ru/123?utm_term=flip+flop+design+template In PDF document text
    • http://wirelessinfo.ru/epsxe_bios_plugins_pack3xjx0.pdfIn PDF document text
    • http://awpmode.com/jakesokowogijelukavg6abv.pdfIn PDF document text
    • http://remastacer.com/wamovatewefatesalujiraoda2z.pdfIn PDF document text
    • http://kixesisero.22web.org/hoover_windtunnel_max_capacity_upright_vacuum_cleaner_with_hepa_media_filtration.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://porojerosisogu.rf.gd/formal_email_examples_for_students.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/5052972501.pdfIn PDF document text
    • http://zebigibozudival.epizy.com/47400458492.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_ec1b3b6b943f4e4291a6ece66db8cc28.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64abb8a4-ee6d-46d5-ac72-e5f4923fa941/scarlett_18i8_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b79e36-cba6-4e22-9b7e-28c8d710449c/how_much_is_a_transmission_for_a_ford_ranger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0530ab48-61d6-4f4e-9252-fba3eb82d4f8/big_green_egg_pizza_stone_xl_price.pdfIn PDF document text
    • https://92e0cadd-ca3c-497d-ba7d-1aece6ee6da0.filesusr.com/ugd/008e52_c960cbabfb40497699ca0969e9555a2d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5a2dfe6-abb6-4204-8ce9-9330b2fdc7ef/cadette_breathe_journey_take_action_project_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/duwoxikiwelusi.pdfIn PDF document text
    • http://kifinuneniw.rf.gd/can_you_hook_up_2_tvs_to_one_dish_receiver.pdfIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_f57343103f6049e6a240e05541a1617b.pdf?index=trueIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_a1499fdbfc184cd1b2837a5f3821c8b0.pdf?index=trueIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_2b36d7a2f16c4115a5e15947d9871686.pdf?index=trueIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_8af1815fba8d4e4cbb8b7f2dfe5f85eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa3a08f-20dd-42c7-8ed1-8f17264d11bd/jadezulabodidetotozeba.pdfIn PDF document text
    • http://fizanotafogibag.rf.gd/93699701728.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/70210409803.pdfIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_c231c3b9874444a2971066f7c54707a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/aoa_diabetic_retinopathy_guidelines.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_off0000f652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 5220 bytes
SHA-256: 287645aa6ae7a730d9ecc00327de68c22566a29f7e6e69237f6d3cf716718d80
font_01_sfnt_off0001080c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 11112 bytes
SHA-256: 1886d39669d5893fd25940425296d7b765675d40ae37b7a51af2bc52eba21214

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