Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66034b004213702…

MALICIOUS

PDF

84.9 KB Created: 2021-03-30 21:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6832b37e2ae5b6beed2e4fe0fc98cd89 SHA-1: edd22af2575d297cc779bc1cb85cc49f4c6e1c54 SHA-256: f66034b0042137021ef2d5b04971f767cea181e08f5dc31eba289ec1760a625d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL leading to a domain associated with phishing and link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing site disguised as a search result. No scripts were extracted, but the PDF structure and embedded URIs suggest a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 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://jottigo.ru/strik?utm_term=what+is+the+new+dork+diaries+book+called PDF link annotation
    • https://sirutobij.weebly.com/uploads/1/3/0/7/130776617/xibafowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_6044f5ad7e72f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418747/normal_600482d6565fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500189/normal_6062997076762.pdfIn PDF document text
    • https://divojalu.weebly.com/uploads/1/3/4/6/134664609/wipop-rosegidab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385436/normal_5feb4e39bf11b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482207/normal_6032aa788633f.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/venabiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421959/normal_5fd8187617af9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471082/normal_602875b54aa55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414173/normal_5ffa06a10f5d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447662/normal_5fc9316a82d91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443372/normal_60189012f1e67.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/adefcf65-9d43-469c-ace0-116d2e383002/how_do_i_troubleshoot_my_ac_compressor.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/18010948298.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/house_tree_person_meaning.pdfIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_16d03d241e3d405f86631b5d21c11b1d.pdf?index=trueIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_060e70e9c16e472db0cea91f8cea563c.pdf?index=trueIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_76386c1f82754f65a9e43acf4b834960.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/22795600283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f38f8732-f535-4a83-b984-b23280ba427d/jasakijujogemarumaweduv.pdfIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_f600f6c75c8b4b85b4ffd2da31c076e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f193646d-6c4e-42ad-9267-6022c0ebaf1e/38102379846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a33e7b3-750b-4c2a-bd1b-32046cbeb057/dish_tv_number_to_pay_bill_by_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a4ff019-0d1e-4369-b606-643f71b1aa2e/que_es_liderazgo_situacional_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/jalovulidolabuxuvazim.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 5336 bytes
SHA-256: 0d98b35d585ba234f443e0a9fe0a7b023f01f9401a61b141e3f63101eed2e54b
font_01_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 3316 bytes
SHA-256: f7e6fbce42a3d25f4c35df94a1db06775706e7e7bbec9411e657de221c6677c4
font_02_sfnt_off000107d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 10932 bytes
SHA-256: e783c8415bea2cda43f4fe2748db718e693d9df3b30cd943a8e57dddaaefa468
font_03_sfnt_off00012d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5C 17000 bytes
SHA-256: 78391445bc740f364199e8459aa8a907420a1d53e5ccac06cfd52a2d66597f40

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