Malicious PDF — malware analysis report

Static analysis result for SHA-256 18835901739cdb4e…

MALICIOUS

PDF

82.3 KB Created: 2021-05-19 02:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d8c6eafea7faa44baed1406f0cd6b9c SHA-1: 1d519b7d66c6e2ba331fb51c65f4a4f7274112a5 SHA-256: 18835901739cdb4ee03b6b60e0d4bb2da789ff53e66146562dd48a9e76badfa5
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The presence of a 'Password-protected archive handoff' heuristic and a 'Visual download / call-to-action button lure' indicates a social engineering attempt to trick the user into downloading a password-protected archive. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/strik?utm_term=age+of+empires+2+full+version+highly+compressed
    • https://letuwolisabir.weebly.com/uploads/1/3/4/6/134602086/98563f1b.pdf
    • https://static.s123-cdn-static.com/uploads/4372721/normal_600745b7b51f6.pdf
    • https://bobujiwa.weebly.com/uploads/1/3/1/0/131070874/6943920.pdf
    • https://kosukanawator.weebly.com/uploads/1/3/5/3/135304621/temewilifogoluv.pdf
    • https://getenulezawo.weebly.com/uploads/1/3/4/8/134897364/8811937.pdf
    • https://cdn-cms.f-static.net/uploads/4373526/normal_606591d26e5ec.pdf
    • https://sefewazugep.weebly.com/uploads/1/3/5/2/135293251/lalikolidirobime.pdf
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/zulerexov-rinaxo-lonakuwifor.pdf
    • https://cdn-cms.f-static.net/uploads/4379221/normal_602c593ac0a31.pdf
    • https://cdn-cms.f-static.net/uploads/4466368/normal_60191fcb5eea7.pdf
    • https://cdn-cms.f-static.net/uploads/4365626/normal_6022106137147.pdf
    • https://static.s123-cdn-static.com/uploads/4379498/normal_5fe289f087eb3.pdf
    • https://mizijuwewis.weebly.com/uploads/1/3/4/3/134392366/lodudapazepop.pdf
    • https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/354d4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sezebepit/penitekomete.pdf
    • https://uploads.strikinglycdn.com/files/1676de0f-cbe9-4ded-9d1d-0b069e8f2377/eureka_whirlwind_bagless_canister_cleaner_nen110a_lightweight_corded_vacuum.pdf
    • https://s3.amazonaws.com/fifuto/77355166539.pdf
    • https://uploads.strikinglycdn.com/files/945540de-2853-47a4-a423-7f79ce1ac528/garmin_etrex_12_channel_gps_manual.pdf
    • https://uploads.strikinglycdn.com/files/117b3de7-03b8-466d-a6b3-908df19ab565/numerical_linear_algebra_trefethen_solution_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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e96c.bin
87272aedeede80fa3080a15bfbb7539281cc02566609c985f53c4f0e26afdb9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 5640 bytes
font_01_sfnt_off0000fc92.bin
05712f171002a6b6eed95f78ba6e3e8e3b433cf90d71d11490b7160d20d33c04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 11916 bytes
font_02_sfnt_off00012563.bin
c3d0ee408bee49a88931d2ac630a9fb52e88a46fabab5a72aa19e78bbe1d3826		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12563 16376 bytes

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