Malicious PDF — malware analysis report

Static analysis result for SHA-256 21397476746cb5fe…

MALICIOUS

PDF

80.0 KB Created: 2021-03-21 02:31:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a5021cdeb1fa9e29feb8a2852f526f1 SHA-1: 7f3857a9e9b15742cf601c03f0b486173b2141c6 SHA-256: 21397476746cb5fed91aacc709aaddc667f964cc1011ad25d8122ec33ae05607
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, with a specific heuristic flagging it as a 'PDF_SEO_LINK_FARM'. The primary malicious activity appears to be directing users to numerous external URLs, some of which are suspicious. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/aws?utm_term=hunter+pve+dps+rankings
    • http://bukapim.mywebcommunity.org/brand_ibsen.pdf
    • http://bajesiradevo.getenjoyment.net/odisha_map_hd.pdf
    • http://xuvepawa.iblogger.org/jojeriwenopifopiziz.pdf
    • http://bodaweziwov.mypressonline.com/rekemekemebaro.pdf
    • https://wudizabilizone.weebly.com/uploads/1/3/4/7/134745746/momotagagutu_borarof_lubogapiwe_zevaka.pdf
    • https://jufigewadekuxo.weebly.com/uploads/1/3/1/4/131406441/zujijexewaluzanol.pdf
    • https://pukokisawar.weebly.com/uploads/1/3/4/7/134749025/jumepa.pdf
    • http://sofoviwov.iblogger.org/98759480592.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cfc3b22a-bc6f-48a9-a5e2-dcb44138f2f3/what_does_bs_8888_cover.pdf
    • https://uploads.strikinglycdn.com/files/a983f1be-1747-4a7d-b92e-56ff980581d0/guxilaketepepupe.pdf
    • https://s3.amazonaws.com/potamotaz/bpmn_process_examples.pdf
    • https://uploads.strikinglycdn.com/files/656d69df-f625-475a-9caa-f23f1d2f559d/sefove.pdf
    • http://sasukagisodubex.onlinewebshop.net/stihl_fs55rc_for_sale.pdf
    • http://zogoxuf.atwebpages.com/language_race_and_ethnicity.pdf
    • https://s3.amazonaws.com/fisulefajow/wijazuligabofam.pdf
    • http://lexekujuritet.rf.gd/holt_algebra_2_online_textbook.pdf
    • https://uploads.strikinglycdn.com/files/9ea51d1b-1a0f-4208-8318-02241fbc5d3c/masugixererajopov.pdf
    • http://xupudajiwozov.epizy.com/fogijusujajisemepiz.pdf
    • https://s3.amazonaws.com/juvuraguvutoxif/vetewedotuligadej.pdf
    • https://s3.amazonaws.com/doxifuba/what_is_bs_management.pdf
    • https://uploads.strikinglycdn.com/files/7e9eb74f-25e1-4829-96b8-e1a7c33067f7/descargar_el_manual_de_carreo_gratis.pdf
    • https://uploads.strikinglycdn.com/files/0f6f44a0-6b37-4d06-aa7f-abadb98c8ae1/51901147495.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
    • 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_off0000e7a4.bin
d893b502dc504bd238414395ee986126695ebcb99828d936f21148cd2721e5d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 5180 bytes
font_01_sfnt_off0000f960.bin
9e0688f393ebb6081e31db003e769d831363fb17503b7cc743c110df656c22b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 10588 bytes
font_02_sfnt_off00011de6.bin
9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE6 16096 bytes

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