Malicious PDF — malware analysis report

Static analysis result for SHA-256 99eead1ad3b46ef1…

MALICIOUS

PDF

83.0 KB Created: 2021-03-21 20:56:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d5d61b3c29b6c8c18a9004a9399accfb SHA-1: 9b5c5c081cec485eacdcda5eeb470b838469007a SHA-256: 99eead1ad3b46ef16202ed53e2cd9dd4ed04e9f3c97b25c6bb164a1d3b45167f
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 hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/award?keyword=appraisal+journal+pdf PDF link annotation
    • https://cdn.sqhk.co/soribivevi/hhihhiE/wakosuzigukiladusuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/sovebiba/djbjghf/money_machine_2_hack_apk.pdfIn PDF document text
    • https://gavebinakufir.weebly.com/uploads/1/3/2/3/132302735/fd3f47.pdfIn PDF document text
    • http://kadaxejob.mypressonline.com/79443455916.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/fAjcgiG/la_reina_del_sur_3_actores.pdfIn PDF document text
    • https://ratojomivufal.weebly.com/uploads/1/3/1/4/131453965/resen-xutozakarada-lepor-vivusixojamus.pdfIn PDF document text
    • https://cdn.sqhk.co/jitegoji/dNobLe2/33368609003.pdfIn PDF document text
    • https://fuvejewitopi.weebly.com/uploads/1/3/1/0/131070508/kefutapebaz.pdfIn PDF document text
    • http://lupazul.mywebcommunity.org/celebrating_diversity_through_world_literature_grade_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_3a56d39a21994819bb2e1cc183d35e76.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54fafa38-5564-40fc-ba28-537a187eb1d0/john_deere_6620_combine_fuel_capacity.pdfIn PDF document text
    • https://ba9dc33f-61c2-415e-8598-c57272458a21.filesusr.com/ugd/c05727_1b664e637a12474889d51bee51bff1a2.pdf?index=trueIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_831641cf6c6b435889419a99f89f9a87.pdf?index=trueIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_c1ef0c207b154290a6d6440a8d160bdc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/neporezofov/harry_potter_books_set_price.pdfIn PDF document text
    • https://d2d110b1-dce0-4b0c-bed7-be24280b7a6e.filesusr.com/ugd/165585_700ace683857445bafcbd7d2c776cc41.pdf?index=trueIn PDF document text
    • http://vumamuv.myartsonline.com/59856538679.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/fariburafavogeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bcf4d0f-ecb1-453f-9f04-6efedb2a227c/modern_family_season_1_episode_14_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d9e475c-ed52-4298-bddb-32b3eaa52302/zofonapovonazutegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/149b1134-99b3-4e30-bddf-e4c1ecf03a63/how_to_reset_bluebuds_x.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/41749915905.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_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 5100 bytes
SHA-256: 59542832d6b3c886ab74fb3b8bbddaad18f64053d526b8f69205bee88aeeb847
font_01_sfnt_off000119bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BD 10732 bytes
SHA-256: 7b06ff2d63109ca94f11efb45cbfbfb25ae8bc504a4ab6d6c3d77fa5b29d1911