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
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to various PDF documents hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 PDF link annotation
    • https://tedamitaza.weebly.com/uploads/1/3/0/7/130740371/kekofo.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16225ddb783775---54488051467.pdfIn PDF document text
    • https://sukewemuzi.weebly.com/uploads/1/3/4/6/134668821/jisogelagud.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/japafiti.pdfIn PDF document text
    • https://tewagolefavir.weebly.com/uploads/1/3/0/8/130814187/79573.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/simajugaputipegemub.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/b7a889c874.pdfIn PDF document text
    • https://zalubaje.weebly.com/uploads/1/4/1/7/141778395/ed5d471.pdfIn PDF document text
    • https://bajulepi.weebly.com/uploads/1/4/1/7/141711873/ad3dd7ffb381c.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/kidikimu.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/14556722747.pdfIn PDF document text
    • http://www.jw-kids.jp/kcfinder/upload/files/43071196672.pdfIn PDF document text
    • https://sufexijim.weebly.com/uploads/1/3/4/6/134679247/wajob.pdfIn PDF document text
    • https://basupetuwesaf.weebly.com/uploads/1/3/0/7/130739706/6482583.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/rudadibiguvowopixi.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/guduwomivatifosubajumix.pdfIn PDF document text
    • https://latijazaw.weebly.com/uploads/1/3/4/3/134312978/8252424.pdfIn PDF document text
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/f361acda.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/numatekizateweruv.pdfIn PDF document text
    • https://kor.mycultureis.com/FileData/ckfinder/files/20220507_EE825ABB7803B578.pdfIn PDF document text
    • https://zomijozefabeten.weebly.com/uploads/1/3/4/6/134636393/e429721e6bd.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/95737489632.pdfIn PDF document text
    • https://soregekewo.weebly.com/uploads/1/3/4/2/134266411/gekefejunaleju.pdfIn PDF document text
    • https://pebufaso.weebly.com/uploads/1/3/5/4/135400671/9665786.pdfIn PDF document text
    • https://webmanagement.colortown.ro/images/file/gupuwaduzerivubugotog.pdfIn PDF document text
    • https://trexanh.net/upload/files/wixikivevolumavebokuvijus.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/85768264665.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A3 11556 bytes
SHA-256: aa9bc278805380cc179cdf1bf75fdc23b531440839b7f9472c41722224f40b6c
font_01_sfnt_off0000dd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 20984 bytes
SHA-256: 154681d56f0dcb81576bd596160c08e206a58bcd7977cc958cdc7f02f78acd1f