Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8cd83efb5cb1c9…

MALICIOUS

PDF

80.3 KB Created: 2021-03-24 02:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bb5bcad7d0bf09b4024d0b8ee8f5774 SHA-1: 2904e0d493e4ad9a4d6cd6237a02175cb26605db SHA-256: da8cd83efb5cb1c96fac667bf07be75805e65d2daf6930ff799990eedd73f130
156 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, identified as a PDF link farm. The embedded URLs and the heuristic firings strongly suggest a phishing or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of external links and the ClamAV detection indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/123?utm_term=job+offer+rejection+letter+template
    • https://sivanijizifi.weebly.com/uploads/1/3/4/8/134848714/1003145.pdf
    • http://dawexefif.getenjoyment.net/great_depression_era_recipes.pdf
    • http://kejoxemubogese.mywebcommunity.org/45222843479.pdf
    • https://kenufipafalenar.weebly.com/uploads/1/3/4/6/134616414/rizakaxe.pdf
    • http://bukawavado.medianewsonline.com/48926764343.pdf
    • http://duwulavodawu.22web.org/49882639914.pdf
    • http://maxobujixeweden.sportsontheweb.net/kukotu.pdf
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/tuxelulevi-sokobonun-veluditesarikag.pdf
    • http://dobuwiwitevotir.sportsontheweb.net/nimipepelelolexidodon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/norozovijalu/bivinove.pdf
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_3cbc59c166294a16a202f7768765ee1b.pdf?index=true
    • http://tutakaxebi.epizy.com/lg_v20_screen_price_in_ghana.pdf
    • https://53a16821-66c7-4e02-902c-89005cbdba6d.filesusr.com/ugd/e5cbe5_417fd1c797b84f2ba813179a3a21f251.pdf?index=true
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_80470c06f71440c7bd658a86cf063da9.pdf?index=true
    • https://s3.amazonaws.com/nawosineromigi/acidification_of_urine.pdf
    • http://rigidafavubo.myartsonline.com/printable_daily_oral_language_worksheets_5th_grade.pdf
    • https://s3.amazonaws.com/rawesaragegugar/facebook_design_layout_template.pdf
    • http://rufujomuxa.epizy.com/wiritojiwisejuwozajiv.pdf
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_aa879f6a5c744d258645a8df95846048.pdf?index=true
    • https://s3.amazonaws.com/jipowumat/caracteristicas_de_algoritmos_cuantitativos.pdf
    • https://s3.amazonaws.com/zeworibuzoza/vuzujokuli.pdf
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_739ff029ccff4ccb98d8668bb50e55b8.pdf?index=true
    • http://najorenowodume.epizy.com/cadillacs_and_dinosaurs_2_exe.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_off0000fc41.bin
f1b996e3b4f8b3e1975ce3616fe94c72add6b0458fcc532777674940a1e39577		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 5188 bytes
font_01_sfnt_off00010dd7.bin
effda92ed5592b1d9ac09ca6bf863392ef1baa2ad0a9c2bba8088285085b09e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD7 11180 bytes

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