Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e5c56a103ef5be…

MALICIOUS

PDF

74.9 KB Created: 2021-05-22 08:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a169b16cdea4fd7e2f29046151463b5 SHA-1: bb92852dcf79dd539fc4f6cc1fae6b0ea5eae4a1 SHA-256: c8e5c56a103ef5be7e6cad8a37fda992f5f137744fbe0ea6e801e05a0bebf676
216 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many of which are likely part of a link farm, and one specific URL is identified as a potential phishing lure. The document's content, despite being heavily obfuscated, suggests a lure related to recovery secrets or private keys, indicating a phishing or credential harvesting attempt. No scripts were extracted, but the presence of numerous external links points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=what+is+a+slightly+fatty+liver
    • https://vimititop.weebly.com/uploads/1/3/4/3/134339659/bafuminudefigeg.pdf
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/vupafe_mubokegimaka.pdf
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/6802117.pdf
    • https://miwimuwal.weebly.com/uploads/1/3/0/7/130775744/8079292.pdf
    • https://bojebunu.weebly.com/uploads/1/3/0/7/130775379/rijuzupidamisip-bazax.pdf
    • https://vaxofawaz.weebly.com/uploads/1/3/2/6/132682661/vijalegoxubideka.pdf
    • https://wenezobu.weebly.com/uploads/1/3/4/6/134625155/b341241a3.pdf
    • https://lekumoga.weebly.com/uploads/1/3/2/6/132683130/xeval.pdf
    • https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/9131a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wozoxub/critical_care_transport_certification_exam_review_manual.pdf
    • https://s3.amazonaws.com/zusevamasor/is_microsoft_sculpt_keyboard_compatible_with_mac.pdf
    • https://uploads.strikinglycdn.com/files/c71c3d68-9ede-4024-9470-16b458f2e984/8493980870.pdf
    • https://s3.amazonaws.com/vabedafozo/pabuwixazederinotuxane.pdf
    • https://uploads.strikinglycdn.com/files/e4c4d945-7025-46dd-89cd-9f2d38e6913a/dragon_age_origins_xbox_one_all_dlc.pdf
    • https://s3.amazonaws.com/wonumafubij/auto_air_conditioning_issues.pdf
    • https://s3.amazonaws.com/falufusu/joggle_definition_sheet_metal.pdf
    • https://uploads.strikinglycdn.com/files/ee9b630c-d54b-4652-8160-eac96a2b32c6/vegan_foods_with_no_carbs.pdf
    • https://s3.amazonaws.com/wufujudisu/judazatubawuvobevokima.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_off0000e871.bin
8af150371b2bfd7f8143c2703a323a69db97a624b7f93e88586bad5e3da859ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE871 5204 bytes
font_01_sfnt_off0000fa3b.bin
c22529568303ac1fd0d11b73bbdd4d49fe18e2fdf4271bff8cf58cf8dbe87dae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3B 10628 bytes

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