Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18ded18938b7094…

MALICIOUS

PDF

79.2 KB Created: 2021-04-22 11:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9c18422acf8db051e301522fa4126448 SHA-1: 25e3bd83a28ebe2dfb72c35ec73a2db8c6d48c08 SHA-256: f18ded18938b7094ea297263f3dac968726589a73aab56ad34d45e5c762869a2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute traffic or host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with spearphishing attachments used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=the+minister%2527s+black+veil+analysis+sparknotes PDF link annotation
    • http://shoop-fe.ru/550860197580ihr1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_6017b91f0f1dd.pdfIn PDF document text
    • http://razvivatel.blog/lufidewizukapevutikowiwq16wq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408195/normal_5fed4a919f1e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451377/normal_604026c1b0542.pdfIn PDF document text
    • http://titanovyi-filtr.ru/256731446083q69w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_60694fd611c60.pdfIn PDF document text
    • http://chambrely.xyz/perimeter_using_square_units_worksheetskpbzw.pdfIn PDF document text
    • http://rineset.xyz/80560147499rn439.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_698a1e1097134955a0a35cbe0595f022.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/81deadea-d57e-4afc-a581-ea55251bf51a/kubler_ross_5_stages_of_grief_examples.pdfIn PDF document text
    • http://jedenibiripo.epizy.com/day_to_day_timetable_template.pdfIn PDF document text
    • http://gejujebiwibi.epizy.com/45546411484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e604298-927b-4249-8045-0f3bebb1fbaf/dyson_dc39_hard_floor_tool.pdfIn PDF document text
    • https://e6343aec-df69-40e7-9959-3c0c55bf73c9.filesusr.com/ugd/6a9017_77e89b93da1d4d6f80ffadc0a51eacc4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0876ea84-dd36-4ac3-884c-89cdbf8b1489/the_house_with_a_clock_in_its_walls_2018_movie.pdfIn PDF document text
    • http://gadomorepizof.epizy.com/55204378545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d8318b0-4792-4d3e-9cbc-42036cc87ae6/pet_sematary_cat_name_church.pdfIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_f0de9e5fd7374c739c1339e0a317ee0f.pdf?index=trueIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_95250888ba504309a54514ef634344ce.pdf?index=trueIn PDF document text
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_3d7459808f8b40de9d21a05f289c6686.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5c2d268-6890-499d-81cf-6eb4a769e1f3/how_to_develop_spiritual_gift_of_discernment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd30f72-72b7-49ae-bcac-159511ddb32d/chauvet_obey_70_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dc87a27-8267-45ca-85c1-189e9928bc1c/pubuvevamagurovekekoxi.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_off0000f50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50D 5520 bytes
SHA-256: 33499b4bd2d093f10dbfeb1777bb51ae06c3e0b2d55bee325945c8a9dcf8e67c
font_01_sfnt_off000107b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B8 11128 bytes
SHA-256: 62d93402333607e1b4532e55ec4a37ea5260138307bc1e7bf391ff5f77325408

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