Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa35a6a148e88e3…

MALICIOUS

PDF

96.6 KB Created: 2021-03-19 10:55:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1d0f25eee94557abf197eafa32ffa360 SHA-1: df802ce732de178fbc81c084b64e0b0c073559bf SHA-256: daa35a6a148e88e37bc65587970ed5d5509b385a4ec2f27e44b3017f97c51a9a
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • 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://dafemum.ru/wix?keyword=toonami+demon+slayer+schedule In PDF document text
    • http://flymoney.net/why_is_my_roku_stick_not_connecting_to_the_internetypzn9.pdfIn PDF document text
    • http://subfamjtii.site/73274733560igeg5.pdfIn PDF document text
    • http://pifemukopisare.sportsontheweb.net/alimentacion_en_camelidos_sudamericanos.pdfIn PDF document text
    • http://momentshop.space/slender_man_meme_generator_button_choicesw2q9.pdfIn PDF document text
    • http://juxowupekabaf.mygamesonline.org/sibexivawokoxid.pdfIn PDF document text
    • http://timurberg.ru/21008055656ae7w7.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/what_are_the_four_types_of_motherboards.pdfIn PDF document text
    • http://ketadiets.site/what_color_is_honda_transmission_fluidatret.pdfIn PDF document text
    • http://zofunubesosena.mypressonline.com/lowiz.pdfIn PDF document text
    • http://bomawowaziwan.iblogger.org/chronological_resume_template_examples.pdfIn PDF document text
    • http://farunoraxukiz.getenjoyment.net/ap_10th_class_biology_textbook_telugu_medium.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/cc610bc1-0a20-42d4-b69c-f47a6fcbd5e6/xukevitelawilenir.pdfIn PDF document text
    • http://duvuxosejoxogu.rf.gd/isometric_sketch_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff353d12-a539-4a61-acca-6adf93d77f46/what_are_the_five_groups_on_the_diffusion_of_innovation_curve.pdfIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_df8cc1a1867943deacb960931c2719bb.pdf?index=trueIn PDF document text
    • http://tixofimisupabev.onlinewebshop.net/daffynition_decoder_d_36_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1282cf3d-c273-4537-bd4f-8b693cbd4f26/par_quoi_remplacer_le_cognac_dans_une_farce.pdfIn PDF document text
    • http://moworuz.epizy.com/romeo_and_juliet_act_4_scene_1_study_guide_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9783700c-f599-4258-a7ef-3fcebeef11e1/how_much_is_a_commodore_64_worth_now.pdfIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_eeec43a25f114f68ad3fad99750dda0e.pdf?index=trueIn PDF document text
    • http://wofeginu.rf.gd/pujuxovedabisuputelipuniw.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/mibumitudaf.pdfIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_1c22f0ca93234fad99af29422949b43f.pdf?index=trueIn PDF document text
    • http://bufalirafuma.epizy.com/pojopovigetetopar.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F6 4148 bytes
SHA-256: a3a9187e8267e072bfe7502d1a0cffe13fa1254b7467d82257268578568a3ebc
font_01_sfnt_off000138a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A4 5228 bytes
SHA-256: b7c3101587c5036e52572334b3c50b4d365af19f9c521a03e3108a339fab3f6c
font_02_sfnt_off00014a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A48 12608 bytes
SHA-256: 7f8ab5dc8ac1855326e226e8c2f70ebb7b3a543c9e4da1f3fafb1ebb5b7fde0f