Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a9e8ffda84cadb…

MALICIOUS

PDF

118.3 KB Created: 2022-05-29 22:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15
MD5: ed0bddb579c7444ef6fcbe457d603c00 SHA-1: 6c17ea477f093a1246e113dd3ba0731d8b3de81c SHA-256: 85a9e8ffda84cadbeaa7e117918dc69dfee7252cfefeaa05960653d3802f5bd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, and detected by ClamAV as Pdf.Phishing.Trojan. It contains a large number of external links, with the primary suspicious URL being https://lazav.co.za/YmrXLWy8. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall indicators point to a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lazav.co.za/YmrXLWy8?keyword=daniel%20and%20revelation%20study%20guide%20sda%20lessons%20online%20login
    • https://somemuzade.weebly.com/uploads/1/4/1/5/141519610/7206446.pdf
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/bunafulej.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/162389ed85623f---19540725521.pdf
    • http://vngo-cc.vn/cooker/public/files/41947486403.pdf
    • https://nuvarimo.weebly.com/uploads/1/3/1/3/131378817/0b1bf8559700f3e.pdf
    • https://tilawifi.weebly.com/uploads/1/3/4/4/134480999/parox.pdf
    • https://tusilagel.weebly.com/uploads/1/3/0/7/130739454/jekikaxuzere.pdf
    • http://asiavent.com/UserFiles/file///46591793065.pdf
    • https://eventpro-kontraktorpameran.com/uploaded/files/82564850212.pdf
    • https://samituvejasuw.weebly.com/uploads/1/3/1/4/131406365/81c1f1ee5.pdf
    • https://pukatuti.weebly.com/uploads/1/4/1/2/141278846/44f3763c737.pdf
    • https://powermailer.in/userfiles/file/rinemukobaxeko.pdf
    • http://aarogyamedico.com/userfiles/file/morenejademagovisevofepa.pdf
    • http://ettis.net/kcfinder/upload/files/19902785085.pdf
    • http://chingyi.tw/userfiles/files/42235406956.pdf
    • http://geologicatoscana.eu/userfiles/files/medegubagorijuna.pdf
    • https://kabezanaxojuzer.weebly.com/uploads/1/3/4/2/134234652/d1c0b53b410.pdf
    • https://mifuneselu.weebly.com/uploads/1/4/1/5/141582809/loxewajevevi-kuvube-gurokok-dipidemija.pdf
    • https://www.disbel.es/ckfinder/userfiles/files/togemopetob.pdf
    • http://krajcsovicz.hu/kcfinder/upload/files/tesituwifefatidovuzode.pdf
    • https://jawibonudinozof.weebly.com/uploads/1/3/4/5/134584949/9094594.pdf
    • https://giwegedunidex.weebly.com/uploads/1/3/4/7/134701534/ketexul.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_off00016bb0.bin
815299f31ca51dd043ac8b1a2bdfda103e9d10224fd57eb5b579e7f4f88c576b
pdf-font-stream PDF embedded font (sfnt) at offset 0x16BB0 17712 bytes
font_01_sfnt_off00019a11.bin
5fe6aec25bad617dd881e47352b4655184a2dfbc8f7f4ab84b2b708a6ca8e996
pdf-font-stream PDF embedded font (sfnt) at offset 0x19A11 10704 bytes
font_02_sfnt_off0001b296.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B296 16792 bytes