Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb82c4089433b702…

MALICIOUS

PDF

71.0 KB Created: 2021-02-27 11:06:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1a5d9a49b95e622a6fba7aebe30a250 SHA-1: 7e5eb42b20e241891481cb96510b77a320a51f22 SHA-256: cb82c4089433b7026ef66bfa6afd86745e2d2a24dc852f378ef25ec85a648362
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a Samsung manual, directing users to potentially malicious URLs.

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://seumenha.ru/wix?keyword=samsung+level+box+slim+manual
    • http://iqecoportal.ru/tarusogimaronazeguz0u0zg.pdf
    • http://arfesopt.com/how_to_change_the_temperature_on_a_rheem_hot_water_heaterv6f68.pdf
    • http://wgathering.org/keturekaju2fkf.pdf
    • https://lesavamu.weebly.com/uploads/1/3/5/3/135347369/tujizewu-fufid.pdf
    • https://bomupafevusoze.weebly.com/uploads/1/3/1/4/131407549/vizese_memobigote_wemalipavigo.pdf
    • https://bejolikide.weebly.com/uploads/1/3/1/4/131437094/c17a77d210.pdf
    • http://vittorguxx.site/clash_of_clans_2019_june_update0vy6t.pdf
    • http://sdek-24.cc/5e_modeline_gre_ders_plan_rnei_ilkokulxs9e8.pdf
    • https://jalesebexiw.weebly.com/uploads/1/3/0/7/130739560/zipafube_repaz.pdf
    • https://boxavukexuzar.weebly.com/uploads/1/3/0/7/130775797/7f6d74.pdf
    • https://suwekamepegatir.weebly.com/uploads/1/3/2/6/132682685/gonabogekomor-wogonuje.pdf
    • https://ziwagugo.weebly.com/uploads/1/3/4/1/134131511/mosewit.pdf
    • https://safipeta.weebly.com/uploads/1/3/1/4/131408280/pamuzobetila.pdf
    • https://xuwogojike.weebly.com/uploads/1/3/1/3/131380868/xileza_gabewunexonixo_laxazuduziragu_pimumok.pdf
    • https://motanaweda.weebly.com/uploads/1/3/4/3/134316912/kuvezufamul_buxolide.pdf
    • https://fexasesari.weebly.com/uploads/1/3/1/0/131070539/rawomenusapep_sawesuzif_vuredak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/juvosi/xezapigon.pdf
    • https://s3.amazonaws.com/nijosinizo/sekifademodudalomulejafe.pdf
    • https://s3.amazonaws.com/bofake/xejimukupoledogulizafevag.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd95.bin
1fe02e02f1f4e36a78e248a201d7fa974a8420cd652ecc7cabe016bbb1179a3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD95 5084 bytes
font_01_sfnt_off0000dec2.bin
88537b5d5fb8e5157133bb6ba2fa9f0b12b80d308cf717812b1ea987b36e3d99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC2 9824 bytes
font_02_sfnt_off00010062.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 4324 bytes

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