Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd29ebfda891444…

MALICIOUS

PDF

73.7 KB Created: 2021-02-27 16:05:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51cbf656bf3c271ce9b3b6009a0d3791 SHA-1: e5015868d0773c2c44a8d0cb6591ea200b3bf6eb SHA-256: 9fd29ebfda891444253d826cd68a30300a0264533bdc95272d6af3c957ad1dad
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which are structured to appear as SEO-optimized content, suggesting a tactic to drive traffic to potentially malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the primary purpose is to redirect users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wix?keyword=clash+royale+cheats+mod+apk
    • http://marafonsport.site/when_ps5_restock_best_buykxh6x.pdf
    • http://podarokinsta.site/zejutedamulazimeputikuihnzt.pdf
    • https://tijesefufejeje.weebly.com/uploads/1/3/4/8/134858706/gakerojagidadidogo.pdf
    • http://damvglaz0.xyz/button_opacity_androidwuabd.pdf
    • https://cdn-cms.f-static.net/uploads/4412582/normal_5fe705824f41a.pdf
    • https://donurufeto.weebly.com/uploads/1/3/4/8/134898164/1294392.pdf
    • http://rarokafu.22web.org/android_9_update_for_samsung_m20.pdf
    • https://barijenevedi.weebly.com/uploads/1/3/1/4/131438420/490953.pdf
    • http://wide-do.top/mikro_muhasebe_program_indirmu74k.pdf
    • https://vajepagipe.weebly.com/uploads/1/3/4/0/134000011/morugemakobam.pdf
    • https://fefokivaz.weebly.com/uploads/1/3/0/7/130776727/d914a1c8e6.pdf
    • http://lakulikelanu.iblogger.org/tecnologia_de_la_informatica_y_las_comunicaciones.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d826.bin
0f22fdeb6fd46804901b172c26cacb5c6c3a487d25c0c84c96d9d2cbda115420
pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 5136 bytes
font_01_sfnt_off0000e9ab.bin
b43f465cadd70d16d11affed5ba8690a53fc1724bb482eaa30cc30e19c160ee5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 10328 bytes
font_02_sfnt_off00010c4b.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4B 4324 bytes