Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfeff23639107cc5…

MALICIOUS

PDF

76.4 KB Created: 2021-03-22 23:55:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88ad0285a810678a2c06ca528a100181 SHA-1: 5580c5ce9b91d96b4f2eb5d093f12df97fd7dde0 SHA-256: cfeff23639107cc5ce47ff2be909fb0c1abea4c97a24edc44a78708beec15724
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized titles, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/award?keyword=liberalismo+en+tiempos+de+colera+pdf
    • http://dizurexemubegog.mygamesonline.org/28912002367.pdf
    • http://penageli.getenjoyment.net/resumen_del_libro_mil_soles_esplendidos_por_capitulos.pdf
    • https://sewizafisebe.weebly.com/uploads/1/3/1/4/131437566/gazewarezo-fanojedobutis-dakejazut-zeguke.pdf
    • https://tokemata.weebly.com/uploads/1/3/6/0/136081978/tokus_folamurukutag_rosopenig.pdf
    • http://xavimelobuvi.22web.org/94125464099.pdf
    • http://rijexofugovu.medianewsonline.com/what_are_reactive_strategies_in_aba.pdf
    • http://majikok.mygamesonline.org/16155080569.pdf
    • http://benaletuzulug.sportsontheweb.net/adobe_scan_scanner_for_pc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bofake/how_historically_accurate_is_the_bible.pdf
    • https://s3.amazonaws.com/zewimu/nordictrack_gx_4.4_reviews.pdf
    • http://purewowesajumu.myartsonline.com/how_to_reset_lg_hbs_760_bluetooth_headset.pdf
    • http://rodisasedozax.myartsonline.com/51930446973.pdf
    • https://uploads.strikinglycdn.com/files/db2deaaa-6b25-4f02-a7c2-2751f43c1259/21538663138.pdf
    • https://uploads.strikinglycdn.com/files/175b935f-f7f1-467f-bbe9-2d242aed1bd4/42667944502.pdf
    • https://s3.amazonaws.com/sitozi/22168864820.pdf
    • http://tofalit.myartsonline.com/juvuwulovawi.pdf
    • http://vejawojifig.epizy.com/ffxiv_fashion_report_this_week_83.pdf
    • http://pevibije.rf.gd/insinkerator_badger_100_clogged.pdf
    • http://tugurodegid.rf.gd/15864659351.pdf
    • https://s3.amazonaws.com/mamibis/xofudipirotivufusuxede.pdf
    • https://uploads.strikinglycdn.com/files/d761eb0e-25d5-454c-ba01-a9cb63054a83/13412948493.pdf
    • https://s3.amazonaws.com/zaxawetawupo/dejidukulojorize.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_off0000e8f1.bin
9ddad96f042364f3d64158437029dba44fef7248169e4ece09d472b566768160		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 5384 bytes
font_01_sfnt_off0000fb26.bin
f73dbd31577aa5f845f4a96b6df86ae55452bef1312ea25d8415c5a829460a20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 12080 bytes

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