Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e44b99f57d4206b…

MALICIOUS

PDF

83.9 KB Created: 2021-03-22 13:45:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ce93bdf8d9bf77dee51551372508b0c2 SHA-1: 69656af17027770fd583fb658236ce3b404dcad1 SHA-256: 8e44b99f57d4206b3234a2036122da584834bd7aa61c076d4fd1bacf55a1d20c
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 or SEO spam operation. One prominent URL, 'https://mezovuduw.ru/award?keyword=susannah+cahalan+brain+on+fire+pdf+espa%25C3%25B1ol', appears to be the primary lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/award?keyword=susannah+cahalan+brain+on+fire+pdf+espa%25C3%25B1ol PDF link annotation
    • https://kuwupixunipava.weebly.com/uploads/1/3/3/9/133986845/wabowel.pdfIn PDF document text
    • https://berigagagek.weebly.com/uploads/1/3/1/3/131384675/lavifatixopome.pdfIn PDF document text
    • https://saboruxeketeg.weebly.com/uploads/1/3/4/8/134850947/xepitojuxesop-zafibef-sekorogu-jekekenadaji.pdfIn PDF document text
    • https://guxiwuwo.weebly.com/uploads/1/3/1/0/131070036/e573f.pdfIn PDF document text
    • https://nabikiwajozipaf.weebly.com/uploads/1/3/5/3/135391661/2861609.pdfIn PDF document text
    • https://buvekidi.weebly.com/uploads/1/3/0/7/130775196/882b5dd547fbc.pdfIn PDF document text
    • https://guxitubekin.weebly.com/uploads/1/3/4/2/134267073/vaxonita.pdfIn PDF document text
    • https://juwujumatel.weebly.com/uploads/1/3/4/0/134042908/xidigajavuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_3e25bfc92c34426fb4110478048cbe02.pdf?index=trueIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_206a8513b97c40459f36fddc3e5a045e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e2fda5-701c-4561-ba99-bdf9e6d445c2/what_is_improved_choke_on_a_shotgun.pdfIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_a201ef407739450a976f364eee96a1c8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/507d9dfd-5aab-451d-a6b6-3fd79c54e2f6/hatchet_book_by_gary_paulsen_summary.pdfIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_f1b4f2f198664e0e8a9ba8f9d889793f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfc9c6f5-9a3d-407c-9663-06fd98b93048/what_is_the_phone_number_for_child_support_enforcement.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/biocentrism_lanza.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/how_to_renew_cpr_during_covid.pdfIn PDF document text
    • https://da25564d-e3c2-4b9b-87ba-dd8ce2ae78d4.filesusr.com/ugd/c82cd6_185dfaf468c5484bab7a4a750fc6769b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/kenmore_ultra_wash_quiet_guard_3_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/how_to_get_sponsored_by_nike_football.pdfIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_4c07d2c1435147a491fce7465a7b6b12.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/harry_potter_freeform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/076b03a3-570b-4efc-ba48-d243f6060a0b/what_are_the_different_types_of_process.pdfIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_62312ee3466e4327b69f18970cf07c20.pdf?index=trueIn 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_off0001056f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 5696 bytes
SHA-256: 688a360431e45ce04f6216a18812d0a00dd717e3455bbbb128f0ed5c464146e4
font_01_sfnt_off00011880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11880 11580 bytes
SHA-256: 52f27cd4d81604259d5b1d89142b07958e52fcb5c861df91956ff8fb628bdcdc