Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8712c7d4927b54…

MALICIOUS

PDF

74.9 KB Created: 2021-04-03 23:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 55781e33828a5837c45b74671469a235 SHA-1: b6a44893c19a1adf5802c9ba27eb25c4bbd24046 SHA-256: ba8712c7d4927b54b8d59ccd83274aacdc9344a68a3f47646cc6e24e0d5f0b4f
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely attempting to direct the user to the identified malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://midufefew.ru/award?keyword=business+plan+for+a+startup+accounting+firm+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426425/normal_60656ed52ca89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422914/normal_6041c7d60fd02.pdfIn PDF document text
    • http://leree6.club/how_to_sync_petsafe_shock_collar961gj.pdfIn PDF document text
    • http://pokupka.space/24772687806ittna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_5fe99d02cbc0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465012/normal_5ffe6b478e603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403140/normal_6026e5ecebb7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_c124076382b94561bc010d06a3124b20.pdf?index=trueIn PDF document text
    • http://pexoroxijaseduj.rf.gd/is_canon_powershot_sx540_a_dslr.pdfIn PDF document text
    • http://zurutoraxavifes.rf.gd/online_converter_to.pdfIn PDF document text
    • https://b724dda4-e2e0-47c5-811c-ae3b7273578b.filesusr.com/ugd/a1e5ee_6ad37bfc20834545a9ed25a7bba6e7b9.pdf?index=trueIn PDF document text
    • http://goxojerodumofag.epizy.com/base_de_datos_relacional_definicion.pdfIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_a8e79da36f894be496be21d4f0cde20a.pdf?index=trueIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_e79e735e852548799d43156042cc71a9.pdf?index=trueIn PDF document text
    • http://selifesupenikiv.epizy.com/camtasia_video_editor_32_bit.pdfIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_b9137b4332984386b1e753208c77f38c.pdf?index=trueIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_bf7fe40a279743aa98fe2f21617c7c7e.pdf?index=trueIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_674d82f952774098b897fbd0a22c5eb7.pdf?index=trueIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_cd6f3d1549ce49dc98a40ec9288fd67e.pdf?index=trueIn PDF document text
    • http://kedadav.rf.gd/audio_power_amplifiers.pdfIn PDF document text
    • https://9b321a86-0615-40a7-b684-6dced782f4cc.filesusr.com/ugd/e3cae3_4814f1c187044657babd0fe82f262237.pdf?index=trueIn PDF document text
    • http://lapabogi.rf.gd/tet_key_answer_sheet_2020.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 5524 bytes
SHA-256: b4e64c28c09c942e04538312952bb35d93ad904b42b38e88f6e42f8c71909e10
font_01_sfnt_off0000fc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC47 10800 bytes
SHA-256: f3c20c58fc37ffd830d215a191bea100911b0a25955dd3418fdc7b08891f1d24

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