Malicious PDF — malware analysis report

Static analysis result for SHA-256 c964f3eb70645bfa…

MALICIOUS

PDF

79.0 KB Created: 2022-06-04 07:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15
MD5: 9fce68f34d6f299b9ffe8bc107a44a20 SHA-1: a9894362e0a8f762778c53903cb556d9ae9fc8c3 SHA-256: c964f3eb70645bfa0be9215d32485ece8112b43ce01ec02b0b2b1cbb0e4fa50f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO poisoning attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via the linked URLs. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cafij.co.za/YmrXLWy8?keyword=three%20books%20of%20occult%20philosophy%20book%20pdf%20online%20pdf%202017%20download
    • https://tedamitaza.weebly.com/uploads/1/3/0/7/130740371/kekofo.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16225ddb783775---54488051467.pdf
    • https://sukewemuzi.weebly.com/uploads/1/3/4/6/134668821/jisogelagud.pdf
    • http://www.prodomasa.com/ckfinder/userfiles/files/japafiti.pdf
    • https://tewagolefavir.weebly.com/uploads/1/3/0/8/130814187/79573.pdf
    • http://maximaviajes.com/FCKfiles/file/simajugaputipegemub.pdf
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/b7a889c874.pdf
    • https://zalubaje.weebly.com/uploads/1/4/1/7/141778395/ed5d471.pdf
    • https://bajulepi.weebly.com/uploads/1/4/1/7/141711873/ad3dd7ffb381c.pdf
    • https://drrajanmahtani.com/userfiles/files/kidikimu.pdf
    • https://stephankeppel.com/userfiles/file/14556722747.pdf
    • http://www.jw-kids.jp/kcfinder/upload/files/43071196672.pdf
    • https://sufexijim.weebly.com/uploads/1/3/4/6/134679247/wajob.pdf
    • https://basupetuwesaf.weebly.com/uploads/1/3/0/7/130739706/6482583.pdf
    • http://radyoislam.com/resimler/files/rudadibiguvowopixi.pdf
    • https://etravelbox.com/scgtest/team-explore/uploads/files/guduwomivatifosubajumix.pdf
    • https://latijazaw.weebly.com/uploads/1/3/4/3/134312978/8252424.pdf
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/f361acda.pdf
    • http://gidromall.ru/img/uploads/file/numatekizateweruv.pdf
    • https://kor.mycultureis.com/FileData/ckfinder/files/20220507_EE825ABB7803B578.pdf
    • https://zomijozefabeten.weebly.com/uploads/1/3/4/6/134636393/e429721e6bd.pdf
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/95737489632.pdf
    • https://soregekewo.weebly.com/uploads/1/3/4/2/134266411/gekefejunaleju.pdf
    • https://pebufaso.weebly.com/uploads/1/3/5/4/135400671/9665786.pdf
    • https://webmanagement.colortown.ro/images/file/gupuwaduzerivubugotog.pdf
    • https://trexanh.net/upload/files/wixikivevolumavebokuvijus.pdf
    • https://volandovia.it/public/fileeditor/file/85768264665.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://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_off0000c1a3.bin
aa9bc278805380cc179cdf1bf75fdc23b531440839b7f9472c41722224f40b6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A3 11556 bytes
font_01_sfnt_off0000dd01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 16792 bytes
font_02_sfnt_off0000f513.bin
154681d56f0dcb81576bd596160c08e206a58bcd7977cc958cdc7f02f78acd1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 20984 bytes

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