Malicious PDF — malware analysis report

Static analysis result for SHA-256 a811b231e8f21287…

MALICIOUS

PDF

116.7 KB Created: 2021-06-02 22:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 19fc340febd0280ea65ba4b2a5967176 SHA-1: 7780788f7703f0c052eec3d6dc420881f11358ae SHA-256: a811b231e8f212870901b6a674b934b6c365b597668e57b82995ca8f4f76dbb0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nomylo.ru/pbw?utm_term=ziya+g%25C3%25B6kalp+t%25C3%25BCrk%25C3%25A7%25C3%25BCl%25C3%25BC%25C4%259F%25C3%25BCn+esaslar%25C4%25B1+ka%25C3%25A7+sayfa PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374540/normal_5ff6816f3182d.pdfIn PDF document text
    • https://jisuxewaxem.weebly.com/uploads/1/3/1/8/131857679/lufibawavu.pdfIn PDF document text
    • https://ledimame.weebly.com/uploads/1/3/5/3/135306483/kirutor.pdfIn PDF document text
    • https://linozimonabeb.weebly.com/uploads/1/3/4/7/134726246/dodawakikeku.pdfIn PDF document text
    • https://xipasole.weebly.com/uploads/1/3/4/8/134853136/nukizigiwijite.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451542/normal_5fdb94a3072e6.pdfIn PDF document text
    • https://nibowivuxewanu.weebly.com/uploads/1/3/1/3/131379040/zatikuvuxizi-jepojojigiki-refobaribozuka-viwabedul.pdfIn PDF document text
    • https://repadugudemi.weebly.com/uploads/1/3/0/9/130969496/5f4db52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404488/normal_6014acf27f1c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368242/normal_603a0ec292993.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
    • http://xetibubib.pbworks.com/f/coloring_book_of_shadows_witch_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36388458-7d73-4737-99f2-059003ee1de9/why_is_my_fire_stick_remote_blinking_blue.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/f/how_much_is_infinix_note_8_in_nigeria_market.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a304ad-6770-4bc3-88a4-cd77d63a80d5/zogikorodafusegalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/397c4725-f400-402c-8f56-8705d1346d02/how_to_write_a_geometric_sequence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c14b4914-2a1a-4b38-8579-39fb772d0d08/lulurujuzujurifivenamig.pdfIn PDF document text
    • http://wusagem.pbworks.com/w/file/fetch/144469839/don_t_worry_be_happy_tamil_song_mp3_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ab8afae-8e19-4673-bab7-8bf305434327/cn_labels_for_chicken_nuggets.pdfIn PDF document text
    • http://padimagofo.pbworks.com/w/file/fetch/144477963/descargar_lista_de_hechizos_de_harry_potter.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BF2 5572 bytes
SHA-256: 42cee2de8202c593cda4fdc19ffcb0bb95932140d499720ea7d5c19f5975fe32
font_01_sfnt_off00018e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E8D 12508 bytes
SHA-256: a050572efd4b5767d0bfaf3e1f3e68ff4de757740796bc5139fdb90d5747e30a
font_02_sfnt_off0001b4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4C6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333