Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad870846ad680839…

MALICIOUS

PDF

84.9 KB Created: 2021-04-30 22:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9ac07401b92c6f02a044c1a90a0a297 SHA-1: eaa0dc1ce13ae9853884694370b2ce9418d07ffa SHA-256: ad870846ad6808398371d5e5a7965c7ae037bd1744ad9e9c57dbee3fc656aa14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. The embedded URLs are the primary indicators of compromise, likely leading to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=bollinger+bands+strategy+forex
    • https://nodejobirutita.weebly.com/uploads/1/3/4/7/134748641/rugofab.pdf
    • http://foxareb.22web.org/13722080016.pdf
    • http://sebemigon.66ghz.com/office_2019_professional_plus_image.pdf
    • https://famixarusefon.weebly.com/uploads/1/3/4/3/134396739/dogulenuru_wigofiv_tovekasixile_tekag.pdf
    • https://radobejaka.weebly.com/uploads/1/3/5/4/135400195/toxupiwulalola_guvajo.pdf
    • http://gutekixawa.22web.org/bolt_thread_size_chart.pdf
    • http://nosetibadap.iblogger.org/domestic_partnership_affidavit_template.pdf
    • http://kujazudoxiro.22web.org/34953177124.pdf
    • https://ripabefemedoge.weebly.com/uploads/1/3/4/3/134321398/vifulevol-padezefax-kigexixito.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://begilokikilox.rf.gd/32179371049.pdf
    • http://sesukunijekoti.epizy.com/67036015239.pdf
    • https://uploads.strikinglycdn.com/files/1ddccb35-2fee-448d-8d25-05a6d813491a/international_financial_management_lecture_notes.pdf
    • https://uploads.strikinglycdn.com/files/63d90e7f-38f6-4f6c-a13f-ec7f8331c717/introduction_to_media_systems.pdf
    • https://uploads.strikinglycdn.com/files/b88a4573-e3b0-4470-9691-a3d1a0177555/xapudipobosegimakupon.pdf
    • https://uploads.strikinglycdn.com/files/c986bc3a-4b34-4580-a740-ee6d881f894b/direccion_nacional_de_la_policia_judicial_del_ecuador.pdf
    • https://uploads.strikinglycdn.com/files/41a6c207-72a1-4893-90b3-54b7f92cc23e/zadavajozanakomirimozisel.pdf
    • https://uploads.strikinglycdn.com/files/276bdc15-b850-4e9d-af01-3b9a71b8ba8f/what_is_stock_dividend_example.pdf
    • https://uploads.strikinglycdn.com/files/e5d8d88e-eb94-475f-b780-8c2af9ff264f/jalarugesujidosuk.pdf
    • https://uploads.strikinglycdn.com/files/cc33afc2-cb3c-453b-a1d2-aba183ae6fc1/69615741854.pdf
    • https://uploads.strikinglycdn.com/files/d63387bc-fba1-4b16-8174-f33521167b2d/mowutavovubodobofibi.pdf
    • https://uploads.strikinglycdn.com/files/5d142117-6965-4354-93b3-002738fc6106/narrative_analysis_in_qualitative_research_ppt.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d65.bin
5ed79c1dc9e7a65a1b939ddb7621d4bb65df74168f2d6ee0fd40907675436f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D65 5436 bytes
font_01_sfnt_off00012004.bin
a2f627d5772f260f73a2d8c44c8b02dab0bfdca4a516ae871e49d034d3475d17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12004 11180 bytes

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