Malicious PDF — malware analysis report

Static analysis result for SHA-256 4273cc58af4f79d8…

MALICIOUS

PDF

85.9 KB Created: 2021-04-01 22:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43374a3fb8dd211a6f722ccc2fc79aa9 SHA-1: b1ff13af967339f5ee532eb50cea8e8909b6da0b SHA-256: 4273cc58af4f79d8928a5292be14a1bfccddc22472b526c13a080a2ff93cb68f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary external URL observed is https://ponafet.ru/wix?keyword=generac+60+amp+manual+transfer+switch, which appears to be a lure. While no scripts were extracted, the presence of numerous external links and the detection signatures suggest a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-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://ponafet.ru/wix?keyword=generac+60+amp+manual+transfer+switch
    • http://xamibava.22web.org/apowersoft_review.pdf
    • https://cdn-cms.f-static.net/uploads/4418199/normal_605ef6d5708d1.pdf
    • https://cdn-cms.f-static.net/uploads/4483097/normal_604507b7f2844.pdf
    • https://cdn-cms.f-static.net/uploads/4502870/normal_6048ed70069dd.pdf
    • http://gunotuje.iblogger.org/wildgame_innovations_trail_camera_3_pack.pdf
    • https://static.s123-cdn-static.com/uploads/4447460/normal_5fe5d40416883.pdf
    • https://nifusesoporiw.weebly.com/uploads/1/3/5/3/135309858/377163.pdf
    • https://gitikaru.weebly.com/uploads/1/3/4/9/134901111/3e84a9f925ea4f5.pdf
    • https://static.s123-cdn-static.com/uploads/4491414/normal_5ff0385064736.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vonolukover.epizy.com/xejidinef.pdf
    • https://s3.amazonaws.com/wexukufedepim/championship_manager_2018_free.pdf
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_9dd94cccc31d436d84fb6940ccaad382.pdf?index=true
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_be3f15ea85f64d899e04adcd4d3ee118.pdf?index=true
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_e9eac0da260c498a8a443c6ca399f934.pdf?index=true
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_fe72189c6b184f2bbd487d40f6c7652a.pdf?index=true
    • https://s3.amazonaws.com/zuwosil/2498454315.pdf
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_caae85f47fc842ddaa2e97242aa17e4b.pdf?index=true
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_e713f88227814122aa13888db258ade4.pdf?index=true
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_868d0dde09cb4973b7d25269a16bc1c8.pdf?index=true
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_3e62ab36b1114a5598dd368d9699606e.pdf?index=true
    • http://firixafuzive.rf.gd/csgo_aimbot_free.pdf
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_365e9d4d64334c32afcf42548df61e1e.pdf?index=true
    • https://s3.amazonaws.com/tixeligufokup/ayo_and_teo_rolex_dance.pdf
    • http://xaxubel.rf.gd/8560869261.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_off00010fb8.bin
47ed2795b70922dd306cc78efe4c397918ac367d3ba924254395606834df3760		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB8 5676 bytes
font_01_sfnt_off000122f0.bin
41d2e8b05a316d000c6e12645529b6c28f4328619c6faae5b86b2d0b3135fd4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122F0 11600 bytes

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