Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8c58db9108e2cb…

MALICIOUS

PDF

90.8 KB Created: 2021-03-22 21:35:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2b4307aaf7f3c41897fb0a7a7dddbda5 SHA-1: 10c8990dec6c3fb2a12bd3cd9a81563cdffc744e SHA-256: 1b8c58db9108e2cbe18c09aa573769189a90c468dd4a944f74e028bb20dcf9c5
186 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external documents. The primary URL, 'https://xajibur.ru/award?keyword=mocktail+recipe+book+pdf', suggests a lure to disguise the malicious intent. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution through these linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/award?keyword=mocktail+recipe+book+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368219/normal_5fedc67a91904.pdfIn PDF document text
    • https://xawoveramexu.weebly.com/uploads/1/3/4/0/134095940/c746a1f0873.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/jitedepujefe.pdfIn PDF document text
    • http://grantmedica.ru/43768472606bl0a.pdfIn PDF document text
    • http://clubstore.pro/vemafakejibudaluxad4uy6w.pdfIn PDF document text
    • https://regajuwanuduxis.weebly.com/uploads/1/3/4/3/134319991/6267069.pdfIn PDF document text
    • http://bluebadge-support.com/godus_wars_reviewo68xe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427799/normal_5ff2980733c72.pdfIn PDF document text
    • http://webmastervlad.ru/wordly_wise_3000_book_8_lesson_4_part_e6wpt5.pdfIn PDF document text
    • http://keto-s1.com/desazavufizamupodoju7g4iw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf21b241-1edd-4e7a-8b85-4b7fa12bec5a.filesusr.com/ugd/835652_3f41164846174844b77fe1576f634eec.pdf?index=trueIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_c0872b9dcabe4b67925064ac9da2b0b0.pdf?index=trueIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_efcbe4689fa74430b17c53220357b0aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc65ccf2-71bb-4be5-bed1-a0780f685dee/how_to_cite_a_website_easy.pdfIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_3bf0c8ca5eb44277885c9c2412ac1e52.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22487340-124b-424c-a0d5-ddfc247802dd/hisense_smart_tv_app_store.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/634772cb-7745-4c36-bdba-761b6425e81f/muwobezoxemijodivixisatin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d895b67-332a-4f70-b767-af4e6faa0d06/the_onion_presents_our_dumb_century.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a015f23-9a32-41fa-bc30-997375d3f8a9/used_2019_lexus_rx_350_for_sale_near_me.pdfIn PDF document text
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_cff2b8fb23f94fa2abed9506a30de0c4.pdf?index=trueIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_a1854e17e7224eed8a14a598cc7a7efb.pdf?index=trueIn PDF document text
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_bcf01c524d134a36a846ad5b53ac22c9.pdf?index=trueIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_e02c300034564287960b1f2f5364e1b4.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C24 5180 bytes
SHA-256: 56d5f013d8cabceb08d33b076f1007b1c15ec7e77dccd8429b648ba9684d6f47
font_01_sfnt_off00011ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 12060 bytes
SHA-256: 9346ad079ea7bfe830e6943e380db890722b524a9a452a5ae48c1ec6151d7e94
font_02_sfnt_off0001469f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1469F 16312 bytes
SHA-256: 028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b