Malicious PDF — malware analysis report

Static analysis result for SHA-256 0162c089a9a01d51…

MALICIOUS

PDF

71.1 KB Created: 2021-05-19 08:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70358e1a7093aa67102c9309c7ff17ad SHA-1: 7449bba35be5a0840903eaec2b63ac9c9ed23fe0 SHA-256: 0162c089a9a01d515295dd5b064053c1890955062cc183ea0f6937616ffd141c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous external links, many pointing to PDF files hosted on suspicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection scheme. The presence of external URIs and the overall structure strongly suggest this PDF is used to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=sopax+fact+sheet+pdf
    • http://nojavit.22web.org/aquae_sulis_and_its_baths_answers.pdf
    • https://lopolovugafi.weebly.com/uploads/1/3/4/1/134109017/4897906.pdf
    • http://tevopose.66ghz.com/77458140332.pdf
    • https://xolopebowuraj.weebly.com/uploads/1/3/4/6/134600193/sutexalowolate.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lidazadopedu.rf.gd/wipuzevuxomuzavenawi.pdf
    • https://uploads.strikinglycdn.com/files/f83379bc-2657-4910-90d3-8cbea8bd3af1/wasodarekoso.pdf
    • http://tanikotik.epizy.com/3224000511.pdf
    • http://wonetone.rf.gd/65654765215.pdf
    • http://bewebumaxof.epizy.com/nimeni.pdf
    • http://bibalaluroxute.epizy.com/gypsum_sheet_plaster_of_paris.pdf
    • http://mozilerinalut.epizy.com/statistical_treatment_of_data_for_descriptive_research.pdf
    • https://uploads.strikinglycdn.com/files/680e014a-c140-484d-9d0c-22010d55a058/how_to_cook_brown_rice_in_microwave_rice_pot.pdf
    • http://riwexakax.epizy.com/depotiviziwerivawikupiwu.pdf
    • https://uploads.strikinglycdn.com/files/b438a705-6b42-48f0-bc97-abd1badb0b68/natutetofatim.pdf
    • https://uploads.strikinglycdn.com/files/9b94a264-c44d-47ac-83ad-a95c7001037a/troy_bilt_mustang_42_deck_belt_diagram.pdf
    • http://zovutexokisabut.epizy.com/sanuvovafopajizinaxi.pdf
    • https://uploads.strikinglycdn.com/files/8b8523ea-a39b-4a90-b3bf-91ccfd7b2a94/rowirorojujites.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_off0000d963.bin
1c500088095e245032e2deeb0b5d338420b933fdab82e4b73485e0ef9c7be661		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD963 5288 bytes
font_01_sfnt_off0000eb6a.bin
64b120ff62c563f0c909d0c763cc2d675ee9bbd790b64ede1073e947083928f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 10688 bytes

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