Malicious PDF — malware analysis report

Static analysis result for SHA-256 d435371e3370d810…

MALICIOUS

PDF

93.8 KB Created: 2021-04-07 21:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 50e5eeef2158ac16a9b22efb42deabc8 SHA-1: 445a15e38132e3a8dc4d99ae0458bc17d158d7be SHA-256: d435371e3370d8105d5cad0e043045db89179b2b5cebd8479c214146fcbb2701
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a high volume of links pointing to potentially malicious content. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the primary attack pattern involves luring users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://nipisod.ru/wix?keyword=baahubali+2+the+conclusion+full+movie+watch+online PDF link annotation
    • https://cdn.sqhk.co/lagazowasobo/ieV9hfk/84344502474.pdfIn PDF document text
    • https://juxagoneponux.weebly.com/uploads/1/3/1/3/131384300/2320791.pdfIn PDF document text
    • https://cdn.sqhk.co/famazipow/hvPubfQ/48120104499.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/8GmhjeA/mobile_ringtone_download_mp3_ringtone_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426413/normal_60052372aca44.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/sirusijebufot.pdfIn PDF document text
    • https://rabusefikitane.weebly.com/uploads/1/3/5/3/135314736/jonop_nefazel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413983/normal_6059222306cf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373511/normal_603bd99759c8b.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekasip/hiPFjjl/wekavasitulekelin.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/FghztUC/69891589957.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/09b54590-06a8-4a6e-b217-86768724c05f/68151818143.pdfIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_c9e0fa379ab8458cb3f858b0b487d7fd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc96b6f-2b03-478c-a9b6-ee26382c1c7b/luferixisiwudonize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc148aa6-61a3-4624-96f5-31d12d313df5/how_to_number_pages_1_of_2_in_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d256c9c4-d252-4d49-8cc5-5c3a475dfc66/john_deere_z425_problems.pdfIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_05f9d0829266417ca116ab4f0ab04da8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b2c6471-0003-4a9b-badc-73957c25415e/comic_strips_for_3rd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87198b4f-bd76-4bde-b2e4-a9b9459b2aad/96346942851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94faebe2-6b27-4cc9-93a6-3387584542e2/imagen_iso_de_windows_7_32_bits_descargar_gratis.pdfIn PDF document text
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_71841b5d84a54a878968bf810e9cbcb4.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_off00013215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13215 5496 bytes
SHA-256: 0570f2dc895b2c9aaee2b1497f9d972b37a037d1fe23b7ba7936d93d29da4612
font_01_sfnt_off000144bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BF 10744 bytes
SHA-256: ba02d7ff62eca6c426141363eee2c5045bd07f55d49537829dc6436876065a49