Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5cf7ceca72cfac4…

MALICIOUS

PDF

75.7 KB Created: 2021-03-27 16:53:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 21f0448ea7c29df42f82126cc8adac55 SHA-1: 24ec409026bebb437ffdc2719d10aa5a678eeba5 SHA-256: c5cf7ceca72cfac43bc331332e78ec902299ff40dfe2e22c13d9397e3f66703b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded links and the nature of the heuristics suggest this document is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.
  • 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://vilenefex.ru/123?utm_term=osmosis+worksheet+biology+mr+croft+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386606/normal_5fe6012f2dddd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_603d533ca910b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_5fe62494402a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446942/normal_600e6d6562a72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481985/normal_6020989f11c3e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_199e3ab780db459e8c1f7aa9b053e42a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/34559404617.pdfIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_a97f9c7ce3c54dd0b8dadbbc1b2ee4fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce1e5f6f-dbcf-4a99-98af-1356a6151851/lawrence_tech_campus_map.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/arris_sbg8300_user_manual.pdfIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_f0c4f8bf00e941caa71cf12709946e0c.pdf?index=trueIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_b3ef3b74b26b4ed693c4acae2741bd1b.pdf?index=trueIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_769e77f0b6c646a19c275e9b0e180db4.pdf?index=trueIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_b2b72d7a53aa4bae8c95e6ec40474bea.pdf?index=trueIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_d993612682d242ae829bed1b1dd81407.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/metformin_in_pregnancy_mechanisms_and_clinical_applications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/603524d9-1c49-41d9-8076-e17820315036/kitchenaid_superba_oven_microwave_combo.pdfIn PDF document text
    • https://8ab8d0a6-ebcf-4503-ac90-3c5d9a0926ce.filesusr.com/ugd/8585d4_ef80d94a77ed48fc82fc4ef34256ca5e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/sipesukujoxopud.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/kannada_movies_free_for_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/hawkes_learning_systems_beginning_statistics_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/rusubowakemolikinetek.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/arrival_soundtrack_zip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3691b2d1-5124-4f3c-949c-1d66e78ac042/zoom_modem_router_5352_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0901787b-3ee1-4ba5-a965-71897dda1ce3/94496760656.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/40182549383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c403461-28ba-4a61-952d-96aad20f156d/xesoz.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD2 2960 bytes
SHA-256: ba9dd86ad06677ef82b9fc66565cbe1db364e5caa8fb73f24ce3e10b7ab9a08b
font_01_sfnt_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 5720 bytes
SHA-256: cdae7b4cbe223414d9a7f35b1874ad1289e443144fd609330299270817607132
font_02_sfnt_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 10948 bytes
SHA-256: 7c66e5ebf932b9299bac58a4e7e1f374ae1dbbbeb709807a4bab50477a20c37f

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