Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ca2e7501d74619…

MALICIOUS

PDF

97.7 KB Created: 2021-05-03 10:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 826d08388955cf654bea2acf8d894782 SHA-1: 2e7f0ba58f9c2c9f0c700816f7e9925c442eba42 SHA-256: 47ca2e7501d7461954c15cd92441c78124df984b0ac8a0e90b8c8f74ff86d68e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary malicious URL identified is https://xezojetit.ru/strik. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=what+is+the+definition+of+social+contract+as+defined+by+socrates PDF link annotation
    • https://cdn.sqhk.co/beledufe/72nVhdz/16098409681.pdfIn PDF document text
    • http://kudorifet.22web.org/apert_syndrome.pdfIn PDF document text
    • https://cdn.sqhk.co/gotoruzud/UGMhdEs/27457371656.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/dQhbhi2/4110780879.pdfIn PDF document text
    • https://kuxelozipapim.weebly.com/uploads/1/3/1/8/131871637/766569.pdfIn PDF document text
    • https://pewoguliburutoj.weebly.com/uploads/1/3/4/2/134234653/dofudo.pdfIn PDF document text
    • https://cdn.sqhk.co/kikepedu/ghswwVG/benasepexexeluzigixiriza.pdfIn PDF document text
    • https://zalozudipob.weebly.com/uploads/1/3/4/6/134673455/vizisiwabegeju.pdfIn PDF document text
    • https://cdn.sqhk.co/luwosera/bkbheht/39532613396.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7bbd626d-771a-4aa7-a3fb-f7749ba02812/pakutofogijojejamakida.pdfIn PDF document text
    • http://giwofigu.epizy.com/metastatic_colorectal_cancer_treatment_nice_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72aeb2e1-d303-47c7-ae00-01190805cbd0/how_to_write_a_novel_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8f513c5-6181-428f-a349-8c822f95bbc7/79944283120.pdfIn PDF document text
    • http://fufibilola.epizy.com/boris_akunin_the_winter_queen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/162538f5-78cb-437a-be7a-7392a2d75dd4/why_is_pre-marital_counselling_important.pdfIn PDF document text
    • https://87098103-4d08-48bb-90a6-807b0ef734b2.filesusr.com/ugd/1f49de_f723f5a643f643c9ad72dabd6c2b0d74.pdf?index=trueIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_7b55fadb86ef40068bc40da31ae32f96.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79643875-b277-4fda-80bd-1176d3325b61/ejemplos_de_marketing_digital_en_mxico.pdfIn PDF document text
    • https://20e8ec16-a7ca-487e-906f-4b2d5c2744e2.filesusr.com/ugd/ab81b8_4fbbdfc37f714b6d9ded455ff6803092.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dbfc9f2-b15a-4d86-8a95-46e82723afe0/naworokekirubupe.pdfIn PDF document text
    • https://doi.org/10In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C0 5152 bytes
SHA-256: 8bc565f78e1d5eff0287a5a28246ef4788d51fc41b4c529255e5b137373ad3d6
font_01_sfnt_off00014540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14540 10996 bytes
SHA-256: d3558010ec176f1837c87a156556450e8344142a1d2fd8011bbd0825186f278f
font_02_sfnt_off00016ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AE0 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2