Malicious PDF — malware analysis report

Static analysis result for SHA-256 549dcb15247263fb…

MALICIOUS

PDF

78.0 KB Created: 2021-03-12 07:22:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ff4495d20363310c27b2ca5e6ac9599 SHA-1: b2dedfb70184f629cf3253c283ea08eb736feff8 SHA-256: 549dcb15247263fb365832023f8f6251f1124307e2f979470a9cf94b96bc6fbb
156 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a phishing or link farm attack. It contains a large number of embedded external links, many of which point to potentially malicious domains, disguised under the pretext of a "2020 open enrollment guide". The heuristic PDF_SEO_LINK_FARM specifically indicates a mass of external PDF links, suggesting an attempt to drive traffic to various sites. No scripts were extracted, but the sheer volume of suspicious URLs points to a coordinated effort to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/wix?keyword=2020+open+enrollment+guide
    • http://coupons2020.info/fepedokegigifotzrwk.pdf
    • http://zelopaqq.xyz/greater_than_less_than_worksheets_ks2flq23.pdf
    • https://womerakuketuzal.weebly.com/uploads/1/3/1/8/131856195/9687922.pdf
    • https://cdn.sqhk.co/zezovajav/4fdiaE0/tegexerovalabusizok.pdf
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/noriwodode_kotavutarofixa.pdf
    • http://rat-red.space/blade_of_god_vargr_souls_mod_apk_full6wokb.pdf
    • https://divaruwidis.weebly.com/uploads/1/3/4/0/134042650/vomubarozetafiriva.pdf
    • https://befukifesili.weebly.com/uploads/1/3/1/4/131453358/b693092c.pdf
    • http://vclean-sale.shop/93075312637on37c.pdf
    • https://cdn.sqhk.co/wiluxuko/2hchj8D/dasuteraxapa.pdf
    • http://itdiscount.pro/81312229084wvwlu.pdf
    • https://cdn.sqhk.co/gudijupimeb/O2Riaha/54084486077.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7dff6ddf-fa42-4f25-bb73-5a97ca97721f/ledebat.pdf
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_14c1072bceb74353a6eb8d1f68151062.pdf?index=true
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_58bc9bdda3a548a890678e7515b2b0c4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5bd2e756-6ed8-452f-80cc-dbc120fd6731/98384124322.pdf
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_6004ef8f8f7d4c35ae4c8959c4636f77.pdf?index=true
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_c80d6cf9e7f54e398c4408d0f553c279.pdf?index=true
    • https://uploads.strikinglycdn.com/files/13ff2e4e-891d-41e0-b245-02012797449e/how_to_program_a_vxl_3s.pdf
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_53d157cf438b42c0aaca1c7e8a5c4960.pdf?index=true
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_8a140834b9be4138bdf80922c16096f2.pdf?index=true
    • https://d848e4b6-662b-4424-a759-963270729452.filesusr.com/ugd/30e015_54d27e32e52e4cb9a675001846310424.pdf?index=true
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_3d014403e32b4365a4d7ac8f608884bc.pdf?index=true
    • 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_off0000f586.bin
5edfb7302d09fc0c13592b7105d4e1bb61988e1a1c3f71c9384f0e8e5eeffd17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 5068 bytes
font_01_sfnt_off000106b2.bin
06108c413910724d967a42b0bf32a70c50a4262cb629feaee7eaba1f72d80c3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 10640 bytes

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