Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afa004e7b1357dd…

MALICIOUS

PDF

84.1 KB Created: 2021-06-09 18:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2414a4ce6865df5575395c27e5b6cedc SHA-1: cf29acf35f58db4254fd90b60617b2e940f4630e SHA-256: 3afa004e7b1357dda56019fac87331b423b9ae7939065f1d42d3fe9686825155
186 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to disposable domains or are used in a link farm, suggesting an attempt to drive traffic to malicious sites. The document body appears to be malformed or obfuscated, but the presence of external URIs and the heuristic firings strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://drafthe.ru/pbw?utm_term=loeb+classical+library+complete+set+pdf PDF link annotation
    • https://newimogo.weebly.com/uploads/1/3/1/0/131070302/9202183.pdfIn PDF document text
    • https://bululirujoko.weebly.com/uploads/1/3/4/4/134487270/3642763.pdfIn PDF document text
    • https://xezujexowesujol.weebly.com/uploads/1/3/4/5/134502134/9067085.pdfIn PDF document text
    • https://wudopivuvev.weebly.com/uploads/1/3/4/7/134752163/gabufa-fubuzewukazak-zogitexiz-lunixivodoz.pdfIn PDF document text
    • https://gobazivow.weebly.com/uploads/1/3/1/0/131070387/3242236.pdfIn PDF document text
    • https://mepaxekedin.weebly.com/uploads/1/3/4/5/134514716/rivivirufu.pdfIn PDF document text
    • https://tumalurezap.weebly.com/uploads/1/3/2/6/132696080/7e9d4c4.pdfIn PDF document text
    • https://kogevinipuban.weebly.com/uploads/1/3/4/5/134514077/4f003.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/7ca3568e-537e-41d4-a858-bcfcb05a66fa/55373979731.pdfIn PDF document text
    • http://zuxanuj.pbworks.com/w/file/fetch/144791178/vomipajirabefikisapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e28b322-5a9e-4487-91ff-6fcb442b171a/cuantos_son_los_libros_poeticos_de_la_biblia.pdfIn PDF document text
    • http://faxofapuf.pbworks.com/w/file/fetch/144702078/53849567017.pdfIn PDF document text
    • http://mokapuv.pbworks.com/f/39254331676.pdfIn PDF document text
    • http://gupipax.pbworks.com/f/45427603506.pdfIn PDF document text
    • http://vawijoj.pbworks.com/f/how_to_get_infinite_gems_in_block_craft_3d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3934d23-bb6e-4430-bd25-629002435854/learn_python_the_hard_way_fourth_edition.pdfIn PDF document text
    • http://palejemevat.pbworks.com/w/file/fetch/144709695/shopsmith_10e_speed_changer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80a94720-0097-482e-af61-81eb0f3a4f8d/3816726919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afd37d89-97fb-4dad-bba9-7a6ea20528c1/mushoku_tensei_sylphy_husband.pdfIn PDF document text
    • http://tujezowosop.pbworks.com/w/file/fetch/144929388/sample_email_to_professor_asking_for_appointment.pdfIn PDF document text
    • http://ronefete.pbworks.com/f/aiou_solved_assignments_code_312_autumn_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2668787-a2a2-40c6-b5ce-74c2de7f4bc4/janitrol_heater_maintenance_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25622c35-0b4e-469d-9249-16ca69a4e4a7/cuanto_equivale_un_decimetro_en_centimetros.pdfIn PDF document text
    • http://gexufak.pbworks.com/w/file/fetch/144555402/building_survey_report_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a0e67d0-185f-4c5b-85bb-ab220c615e2a/set_up_personal_hotspot_iphone_6s_verizon.pdfIn PDF document text
    • http://zelovoguvunu.pbworks.com/w/file/fetch/144427119/butuxepube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f7d3091-eaba-4200-9e9c-873b775082bc/baahubali_1_tamil_full_movie_hd_download.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_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 5484 bytes
SHA-256: d8013caf3923281a09c4a92487ad5be2337c0e7558d943ec5194f5c8a2949595
font_01_sfnt_off00011d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D24 10892 bytes
SHA-256: 77ee68d6587fa7c4e9f05256481afbefe50ac609884eb8656932a1ce56e06d5a

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