Malicious PDF — malware analysis report

Static analysis result for SHA-256 469fe56263da18a0…

MALICIOUS

PDF

100.3 KB Created: 2021-03-24 13:55:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7a91c5ea7ebbad3f7285e7b5a8d34c33 SHA-1: c377e0cb1f2b90a9bbdca62e4f59e4e8a8673a17 SHA-256: 469fe56263da18a00f32920d92e880b96d313caddab54af3220043fd9d9f3cb8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9992

Heuristics 5

  • 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.
  • 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://jacksth.ru/strik?utm_term=personal+statement+for+university+examples+finance PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420930/normal_5fd2e08e9098a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_601e8f60a4a01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417834/normal_6008ea8e87744.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/x2K6Bgd/jedunexivisinukejuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_6034485b37840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464874/normal_604244f22afaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446491/normal_6047b54ca80cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443372/normal_6030e7034307c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460466/normal_602ee03e16b9a.pdfIn PDF document text
    • https://cdn.sqhk.co/pimepojuti/eKijief/56955789376.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Cm9jfWu/13324013923.pdfIn PDF document text
    • https://cdn.sqhk.co/jigixomavola/dlOgcjf/commercial_electrical_load_calculator_excel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503309/normal_60150e4ed6835.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebesoxu/CbT1ghp/everfi_module_5_credit_scores_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401989/normal_5ffb0a55dec56.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/fbb597b6-820e-416e-9cb1-abeffd095273/young_sherlock_holmes_books_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19fea24e-27f0-4f6a-b854-08173beddeab/furizazug.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_d88fd5c3f2a142eb8106cb1245f9c562.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/guide_riven_mid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2147d9e-edf3-46ff-b94f-535ae2380383/verbos_regulares_e_irregulares_en_ingles_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/15785267899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf92a471-677a-4009-8b3d-84f1e3f64cae/the_blue_book_of_grammar_and_punctuation_eleventh_edition.pdfIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_ba7177df64bb43c293d870ff70b4a0eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/lolek.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/45213188045.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000147ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147CA 5392 bytes
SHA-256: bd46f0959fecb0fb819598bd51a00d58e67c9e642a437c34e8b3e62c6cdef4b8
font_01_sfnt_off00015a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A1B 12364 bytes
SHA-256: d0ed1aec56e8ce2486928dbea4aa43de494c7adeca0693c153458553640432b0

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