Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8a69abb1fa08b5…

MALICIOUS

PDF

85.7 KB Created: 2021-04-27 08:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c0cc456d6c2ced962097462aa0d8421 SHA-1: b41e8cc2fc78b7b63cb896819b63916541bc2f90 SHA-256: ba8a69abb1fa08b524ac17bc58a6b5114c262dd77a12c87a2438e54c4859bb49
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm for SEO or phishing. The presence of a 'download' button lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=jazz+blues+guitar+tabs+pdf
    • https://cdn-cms.f-static.net/uploads/4473890/normal_6032277eafca8.pdf
    • https://mojurakikaluno.weebly.com/uploads/1/3/1/4/131438245/2125061.pdf
    • http://suvuxivenorum.mypressonline.com/54927084909.pdf
    • https://cdn-cms.f-static.net/uploads/4421460/normal_60661473e8fd8.pdf
    • https://kutekedutowake.weebly.com/uploads/1/3/4/6/134635623/6d987cfa6.pdf
    • http://wivaserana.mywebcommunity.org/wixurerejizuwovonul.pdf
    • https://zazivepug.weebly.com/uploads/1/3/4/3/134359823/mogap.pdf
    • https://fevapeju.weebly.com/uploads/1/3/4/4/134468187/7ee04320f7e088.pdf
    • https://pobejatu.weebly.com/uploads/1/3/2/7/132741278/vumawefipebiluv_vojezu_sugak_rotuwudepawojaf.pdf
    • https://likuwiwekadu.weebly.com/uploads/1/3/1/8/131857000/1189943.pdf
    • https://filekudop.weebly.com/uploads/1/3/4/0/134017403/d9195d6aaa440.pdf
    • https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/a6c25c8f.pdf
    • https://mufanujirube.weebly.com/uploads/1/3/5/3/135348440/vovixatef_jufobupe_wenor_patedorugokoze.pdf
    • http://pozufopajosel.mypressonline.com/wigitebafediziviwejixaxo.pdf
    • https://pekubitox.weebly.com/uploads/1/3/4/4/134477952/bebanigizogolofevedu.pdf
    • https://static.s123-cdn-static.com/uploads/4365627/normal_5ff37ec4674ae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xuvuzonixo.onlinewebshop.net/xenadejojazuxunarazux.pdf
    • https://uploads.strikinglycdn.com/files/02e4689b-778b-425c-aa47-40b5b4eedbbd/zavupiwupexapekesol.pdf
    • http://tofujuwo.onlinewebshop.net/restrictive_and_obstructive_lung_diseases.pdf
    • https://uploads.strikinglycdn.com/files/c6b9bff3-ec93-4c85-b7de-8b0b731c9361/toromazababojapefese.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_off00011222.bin
511623ba885b0d24ea4a441b2e53c29f6cc8e90edbe0c0ba000346ae42af5843		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11222 5388 bytes
font_01_sfnt_off00012487.bin
2de2e0f686be4144619e0502ea3cfb2581d16e52e8284bf1b80d4cdcf897def7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12487 10940 bytes

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