Malicious PDF — malware analysis report

Static analysis result for SHA-256 8137a581ffe820e9…

MALICIOUS

PDF

75.2 KB Created: 2021-03-15 20:46:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: ce7ea5766f89707852d81438444d16a1 SHA-1: 2d17144f4cf1028da74086b47d71d6ee1035c8aa SHA-256: 8137a581ffe820e937ca6d059f46a6db2e804a1461a86d64b81d9187b6879454
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 hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/award?keyword=struts+2+tutorial+step+by+step+pdf PDF link annotation
    • http://xevamoz.mygamesonline.org/how_to_start_bitcoin_mining_for_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482854/normal_603ba1f6c5d1d.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/google_cloud_security_certification_free.pdfIn PDF document text
    • https://betutoza.weebly.com/uploads/1/3/4/8/134899773/koluwevoza_dejokug.pdfIn PDF document text
    • https://lazaxakekobopox.weebly.com/uploads/1/3/4/8/134878873/wofowagoxusumel.pdfIn PDF document text
    • http://gufopitasuwo.22web.org/bagger_288_transformer.pdfIn PDF document text
    • https://tawatoxox.weebly.com/uploads/1/3/4/0/134018263/2130329.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366973/normal_5ffd008533f6e.pdfIn PDF document text
    • https://teribizekejuxes.weebly.com/uploads/1/3/5/3/135391999/3320726.pdfIn PDF document text
    • http://dukafufuxona.iblogger.org/cable_lateral_raise_proper_form.pdfIn PDF document text
    • http://kogemamumudun.22web.org/37502058736.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/71124389320.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/telewo.pdfIn PDF document text
    • https://pulapafux.weebly.com/uploads/1/3/0/8/130874232/gexufafonekimefer.pdfIn PDF document text
    • http://noxavikadovul.mypressonline.com/30473200454.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugelugadafutes.rf.gd/zuwopibivixex.pdfIn PDF document text
    • http://lujapekadedi.epizy.com/world_map_printable_free_black_and_white.pdfIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_884f6defbac7415cbe27301bd1bdf357.pdf?index=trueIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_8453c03a513a450e8844b18d3c0466be.pdf?index=trueIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_68cfadc864154a209e0d096277f5d5e7.pdf?index=trueIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_59acd1569f754d379ffa052b6c217b59.pdf?index=trueIn PDF document text
    • http://nufulavidibime.myartsonline.com/kuensel_calendar_2020.pdfIn PDF document text
    • https://6d1a2d78-ebd2-4140-94a0-411197be5b5f.filesusr.com/ugd/88ff89_f1759eefbb2d4c5b8d694110d2cffebf.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 5512 bytes
SHA-256: ef4e677321646c1280e7d8520ebaeb326da3f7c941ce5f47f75924b4cf35c3ab
font_01_sfnt_off0000f918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 11216 bytes
SHA-256: 7a71a2f98422c3471b9cf1e9311ef7863933aa15b605c1157bfcd78abaede94c