Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b009b09f1dfbb9…

MALICIOUS

PDF

80.7 KB Created: 2021-03-23 15:26:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e41b9301c337a5f25fb8ee277b3e0b82 SHA-1: 753b34c0933a7e02775efdfc6934736282f118cc SHA-256: a5b009b09f1dfbb90e9abf5ed68609c98edfb8f5cbdf41155c97c95c26ba1fa8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO manipulation or phishing. The heuristic 'PDF_SEO_LINK_FARM' and the presence of multiple external URLs, including one pointing to 'maypoin.ru', strongly suggest this. While no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/award?keyword=diet+after+gallbladder+surgery+pdf PDF link annotation
    • http://seluluxafej.22web.org/website_footer_html_templates.pdfIn PDF document text
    • http://pisibebix.22web.org/the_escapists_2_parents_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e9af4203-2e8e-4f66-a7ee-e19a602bf26e/why_mic_not_working_on_skype.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cf24780-ae84-4e6a-9910-2c7e5ee84aea/55473455820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7150892-77e8-4c84-a368-cc1af888b4fb/kegivofosenitujen.pdfIn PDF document text
    • https://0f424234-9c27-4462-a606-4b2ccecf17d8.filesusr.com/ugd/b42a09_f7b90dd064434a36b9c8b8b10939095a.pdf?index=trueIn PDF document text
    • http://vadeduvizutiv.rf.gd/55221994935.pdfIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_a1ffc7fb373e4dabbdd44711e263651f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb132db0-b6cc-45c3-9604-bbb9d7eeebdf/93001999616.pdfIn PDF document text
    • http://dikifewusexo.rf.gd/automatic_control_system_by_francis_raven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a7ac880-8994-4bcc-9fac-f393357d6bd6/how_to_format_hard_drive_on_swann_dvr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5111dd38-073d-424b-aba2-4a87b1454018/dasubowidudu.pdfIn PDF document text
    • http://noxonot.rf.gd/87536576310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb355103-de1b-4e0a-9816-03e0d7e3cd96/photography_changes_everything_ebook.pdfIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_bca2e57755594afd939decab78d0d477.pdf?index=trueIn PDF document text
    • https://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_b25d4017a9b5414e8f62b476dae566db.pdf?index=trueIn PDF document text
    • http://dobejul.epizy.com/astral_chain_guide_ign.pdfIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_35856c65d44a497ebfcb61f5f45234aa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 5116 bytes
SHA-256: 4a070fa20e1aded3f0439a8b7c2c4359672ca425ee512482c970a3c67a5a6825
font_01_sfnt_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 10460 bytes
SHA-256: 80ed59a986e6fa3fd045de5f718c778d0711b2a89faac808915121aea120558f
font_02_sfnt_off000127c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C5 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3