Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d84b4bdd4612743…

MALICIOUS

PDF

84.8 KB Created: 2021-03-25 02:32:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e17206abcedf44b89f19fa9de91bb92 SHA-1: d8a81bf687f95826e062531fed30b60e14151a84 SHA-256: 1d84b4bdd461274376797d9ab84f9e50dc6bf1627699b0bf9992b64a3d6efda7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is https://seumenha.ru/strik?utm_term=how+much+is+2015+rav4+in+nigeria, which appears to be part of a phishing or spam campaign. No scripts were extracted, but the presence of numerous links suggests a redirection or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/strik?utm_term=how+much+is+2015+rav4+in+nigeria
    • http://rifosavepi.22web.org/padotekedakijodeg.pdf
    • http://taranif.22web.org/adfg_hunting_report.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zevuketeno.rf.gd/mathematical_terms_dictionary.pdf
    • https://s3.amazonaws.com/sazixipame/rukozolovedipi.pdf
    • https://uploads.strikinglycdn.com/files/ad35da3b-f0a0-4a90-a6dc-a6610e1d2118/how_to_convert_photo_into_oil_painting.pdf
    • https://uploads.strikinglycdn.com/files/4915e70a-6876-442f-b3ab-17eac9ac0d4b/dinmicas_de_presentacin_para_adultos_en_una_empresa.pdf
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_7543fd054ae14aea8df3d80b4d1dc3d3.pdf?index=true
    • https://s3.amazonaws.com/padadutiseni/sda_church_manual_revised_2015.pdf
    • https://uploads.strikinglycdn.com/files/933da276-9a38-4b39-bf0f-26e89637700e/30548409647.pdf
    • https://s3.amazonaws.com/jirebonudur/75583804111.pdf
    • https://uploads.strikinglycdn.com/files/da9741dd-11ac-4938-86ba-afc181fde3de/lijun.pdf
    • https://s3.amazonaws.com/pewibim/61892303131.pdf
    • https://10bc5e17-7652-4c7e-9b43-999b3eb3b021.filesusr.com/ugd/5edc69_57a22baf45f74f65bcd84749a988d82b.pdf?index=true
    • https://s3.amazonaws.com/nunakixuma/mitakaletokatozilufesomeb.pdf
    • https://s3.amazonaws.com/libusamagowuvo/6473951054.pdf
    • https://s3.amazonaws.com/widofafane/66259766828.pdf
    • https://uploads.strikinglycdn.com/files/1ee3b112-681e-4f92-a3e9-342c940bd90f/gps_garmin_oregon_650_manual.pdf
    • https://uploads.strikinglycdn.com/files/7c001c36-9017-48cd-9599-202ae8bebbae/122765068.pdf
    • https://s3.amazonaws.com/tufujifinobiro/tapozonulefomekovopike.pdf
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_5cdd15fdd3304367ac0e0e08f4fc7d5d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/88053603-2c93-4399-9108-e1520be48ab9/68551720459.pdf
    • https://s3.amazonaws.com/pusixa/38338246168.pdf
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_8ad2897365974024bda73d954f0492b2.pdf?index=true
    • https://82c1a4a6-0aea-44ab-842b-07cb5bdde860.filesusr.com/ugd/aafee9_05a5970f222a4025a30424b90e503555.pdf?index=true
    • https://s3.amazonaws.com/mulerux/bernina_sewing_machine_instruction_manual.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_off00010a7e.bin
8184e1dfec122b85701ced452b8cbcdd9d95e5e2079def55fb020ef07d28aaac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7E 5832 bytes
font_01_sfnt_off00011e5b.bin
72f755c51803c28cf5cd96d1dfdb08ef5e538326f97eb3c5b4824e60dac4428f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5B 11832 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.