Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49c839aa68f6f94…

MALICIOUS

PDF

76.4 KB Created: 2021-03-24 22:34:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 2b54eff8ac026b874bf4e509a3af5394 SHA-1: 566320648b9d6ac86eb2e9b0900d2baa3056e6d4 SHA-256: d49c839aa68f6f9404c26806f31d14a666aa8133bee8898c90fc75e32e46a1e3
134 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to 'formal letter template word', likely a lure to entice users to click on embedded links that would lead to a download or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/123?utm_term=formal+letter+template+word PDF link annotation
    • https://kuxajikesapo.weebly.com/uploads/1/3/4/6/134638386/tiguk_gedat_vogufujutuneje.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/jhhjhii/stokke_tripp_trapp_baby_set_cushion_instructions.pdfIn PDF document text
    • https://kifajiziwezu.weebly.com/uploads/1/3/2/7/132740821/409e5844.pdfIn PDF document text
    • https://cdn.sqhk.co/gojinuma/cMcFfja/enemy_waters_submarine_and_warship_battles_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/texafikogot/dh0icQE/dark_hero_asus_price.pdfIn PDF document text
    • https://cdn.sqhk.co/wibepudib/lSWHhj3/11979992169.pdfIn PDF document text
    • https://tefuvaxijo.weebly.com/uploads/1/3/0/7/130739162/lofuvataki_vudigebipixami_sofuliz_zebijomusogixo.pdfIn PDF document text
    • https://segamovav.weebly.com/uploads/1/3/4/8/134892249/b887bdb2.pdfIn PDF document text
    • http://sawagemumavegon.22web.org/dajajisikex.pdfIn PDF document text
    • http://sarepoxorak.22web.org/ableton_live_7_for_windows_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xupapuxonoxun.rf.gd/calor_de_combustion_del_n-butano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dc1ca92-0e41-4fcf-acf0-ba5f79426e3e/how_to_troubleshoot_a_furnace_humidifier.pdfIn PDF document text
    • http://mulexotuvatago.epizy.com/zowivisibulojekivu.pdfIn PDF document text
    • http://zikuxivifi.epizy.com/javascript_manual_free_download.pdfIn PDF document text
    • http://mopafanimuwez.epizy.com/low_oxalate_diet_spanish.pdfIn PDF document text
    • http://dizibabazuvuxu.rf.gd/64867214278.pdfIn PDF document text
    • http://deroselewem.epizy.com/siemens_hydroranger_200.pdfIn PDF document text
    • http://fivomasabod.rf.gd/binary_logic_gates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c35d6223-d0aa-4779-a7e9-3afd2fb3b817/98669130725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a481f4c-988e-4ae5-aa6a-01ecd427ba85/doburekofemogek.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 4972 bytes
SHA-256: 5f5cdf67a8105385d15cc4315039a1bb837b6723ec66235f74e71c10dd11475a
font_01_sfnt_off00010114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 10360 bytes
SHA-256: a85cb6100c6e30e34ef7346151f3836a0fd6ab945aeb8bed3b31392eb216d28f

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