Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a45083747594d5…

MALICIOUS

PDF

80.5 KB Created: 2021-03-20 22:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c2a2111517684f02192a9a7588155e56 SHA-1: e556502239cca98eb452944ae62c87dc6bb33bb8 SHA-256: e9a45083747594d5beab33a710c3b011c1d7c891f081fdf82d7459ecd6ed3aa4
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 0.9995

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://gimoguvi.ru/strik?utm_term=how+to+know+polarity+power+supply PDF link annotation
    • https://desebenenoda.weebly.com/uploads/1/3/5/3/135348916/kejumezidujexad.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/how_to_calculate_flow_rate_in_a_pipe_from_pressuremj39x.pdfIn PDF document text
    • https://bubituzujolumet.weebly.com/uploads/1/3/4/6/134647672/6629002.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/nogedit.pdfIn PDF document text
    • https://nutovavodus.weebly.com/uploads/1/3/4/0/134012609/darurusojef.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/29859201666qzy2t.pdfIn PDF document text
    • http://insta-sale.site/32486062445006tj.pdfIn PDF document text
    • http://ziposodepow.mywebcommunity.org/79229569131.pdfIn PDF document text
    • https://jutegejedexugak.weebly.com/uploads/1/3/5/3/135384922/ab18eb23.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/nyuad_academic_calendar_2020-21.pdfIn PDF document text
    • http://jovefupe.mywebcommunity.org/extreme_ownership_free.pdfIn PDF document text
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/witawa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bdbe14a-9259-492a-adde-6655cab86514/fubidesorumatovafuwudizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7cb06e-c024-4bdb-8d6d-e5b51ef77b29/67060178779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0d12981-2539-4443-b346-908a9c93da4c/japurafeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/115d40b4-f8a4-4d86-b477-714da4340ecc/75682869845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34c943d0-46bd-48d0-b5d8-e5717c72c322/fanalezezuxusat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a62146-c707-4483-b127-75f1be71a38b/34818788450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64816970-c3b6-4b6b-ab69-12fbaf98fbd9/britax_boulevard_clicktight_latch_weight_limit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d3467ea-59be-4a82-87f9-0b7adec70986/ba_ii_plus_professional_battery_replacement.pdfIn PDF document text
    • http://tojuzogip.myartsonline.com/vinabatapagadev.pdfIn PDF document text
    • http://polabufu.myartsonline.com/writing_and_graphing_inequalities_worksheet_6th_grade.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
    • 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_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 5032 bytes
SHA-256: 5b952ead10febff265e47322fb9d64910adbec1af2cb635b25ffe5c51f15ffc8
font_01_sfnt_off0000fb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 10540 bytes
SHA-256: b3ee63eb4d32f74db9c4efff6f072fc028983e823cbfc78a2cb6afc6310ef8cd
font_02_sfnt_off00011f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F64 16124 bytes
SHA-256: 0bec6d08f43fc4c5fca3870c53d4aa69f9eed1a4417d6e2d767c794b7d28855e