Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc2b6158444996e…

MALICIOUS

PDF

82.5 KB Created: 2021-04-20 10:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1ab3224fe4b3adbc9a5014c97268a840 SHA-1: 12802cb69a2d10f34ac3beaeb9c219509cb20be6 SHA-256: cfc2b6158444996e0b741048477a3e9f9d35a70feb80f109af839ffd3be0eddb
186 Risk Score

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 0.9996

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://jumiwimov.ru/strik?utm_term=how+to+read+architectural+drawings PDF link annotation
    • https://jopuwijexanubuf.weebly.com/uploads/1/3/0/8/130874501/6373854.pdfIn PDF document text
    • http://braco.ru/39302921124v7d5c.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/terilabifoxuxilatowapo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387933/normal_6051eafd8fea5.pdfIn PDF document text
    • https://boxavukexuzar.weebly.com/uploads/1/3/0/7/130775797/5215281.pdfIn PDF document text
    • http://xaredazisom.mywebcommunity.org/gastrointestinal_conditions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_605602ab99565.pdfIn PDF document text
    • http://axacheat4.xyz/60095372978u7bpn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370077/normal_5fe17edfc5449.pdfIn PDF document text
    • https://repugololenip.weebly.com/uploads/1/3/4/8/134880500/2269468.pdfIn PDF document text
    • https://bebefezagogu.weebly.com/uploads/1/3/4/3/134372182/9b003.pdfIn PDF document text
    • http://bilet-pdd.site/marathi_baby_boy_names_free_downloadiartp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_951bc1eee1214f90be7b41f5b40e1a51.pdf?index=trueIn PDF document text
    • http://peledopa.myartsonline.com/excellence_in_business_communication_12th_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/536b3758-b76c-48c5-a101-5e5d43727e20/vorazusomes.pdfIn PDF document text
    • http://jalijoruki.atwebpages.com/foundations_of_behavioral_neuroscience_neil_carlson.pdfIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_2eacd10c5d1749b2a4069467ca993d64.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9f6ebcf-23d2-4430-a963-5b075e1e2616/you_get_me_full_movie_123.pdfIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_52d1c73b40894350aacba9292ac47d38.pdf?index=trueIn PDF document text
    • https://31e64076-56b3-4e53-9780-179364fbad2f.filesusr.com/ugd/d8d3cb_9eb07b7db59e4866bb1e6f65e7d238a7.pdf?index=trueIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_fdb92cea9f4f44b0b91d07a0564300a2.pdf?index=trueIn PDF document text
    • http://pedirite.onlinewebshop.net/simple_present_exercises_with_answers.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_off00010647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 5252 bytes
SHA-256: bcb43ec5ab4d352acebb1145ed5963f1e8767f3c1842492c2808944be6342808
font_01_sfnt_off0001182e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182E 10816 bytes
SHA-256: d26365f825252b2a928321d9b65c0d3aba2e0817f95f42dba55f20ae5ab72dd2