Malicious PDF — malware analysis report

Static analysis result for SHA-256 71288f2fe24f0bff…

MALICIOUS

PDF

78.4 KB Created: 2021-03-11 04:07:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 050fb58af245ac4328550426ca0f6c3b SHA-1: f536125e843037b5f005d268e92837bc9fc82988 SHA-256: 71288f2fe24f0bff2bf65ae132b42a73b2701fd5927b798cfc443a940f798e1b
194 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The embedded URL suggests a lure related to financial queries, likely to direct users to malicious sites for phishing or malware downloads. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/wb?keyword=how%20much%20is%20south%20african%20grant PDF link annotation
    • https://cdn.sqhk.co/difigobon/RjhgjaN/pure_web_browser_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/5uRgfvN/low_carb_dessert_using_whipped_cream.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/OgijfVP/craigslist_atlanta_for_sale_by_owner_furniture.pdfIn PDF document text
    • http://fionainthefield.org/angry_ip_scanner_filehippo2mb3g.pdfIn PDF document text
    • http://genusadnlo.space/tugazivx367.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_038789f88fbc4837a128472a259f5a06.pdf?index=trueIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_537e7808ddf04fd5b998914d380b1f54.pdf?index=trueIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_7dfbc8f256b94739bbf839f64636d294.pdf?index=trueIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_d2763f591514407498e0384a8219ade3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b51e75a-bef1-47ad-a38f-e14c443903f4/what_is_tcp_hijacking.pdfIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_30f0c6f583e44558962b17bf27f725a1.pdf?index=trueIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_e3a230273cf64842ad92da3be3af243b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e53338ff-abc6-4bab-97a7-b0612a469340/what_setting_should_i_put_my_mini_fridge_on.pdfIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_792f1b2f72c34b358601084a5fdfc14d.pdf?index=trueIn PDF document text
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_145dd2962f964a9fbbc5edf29cdee66c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b3d380-de02-47e3-9109-9967d91e9dcf/just_2_words_plus_462.pdfIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_8a2336f3cbc44597a6f9297233c734da.pdf?index=trueIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_9f5bd6f2ade94db4b48c02cbf4122741.pdf?index=trueIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_69177f84f16343978176d75bea34aece.pdf?index=trueIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_96d85d745b4d4653a3f19f21b5058924.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7b8d402-cd9d-4e54-addd-acccb2fc0b54/70606234777.pdfIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_dd21f1a942ee4230996d84c4a28c2eab.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_2c42f188cb684cd4b45d91ac81a5a665.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_off0000f5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 5316 bytes
SHA-256: 27337db642d406c97122daf17a126b7d37c187c4616665501f3f4401e86a0e7d
font_01_sfnt_off000107bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 10696 bytes
SHA-256: 8f2217ce663735bd9be734e63e8a2e5d92811dc7f85ef5a0b20ddbe75d614b59