Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8132e176d2e0208…

MALICIOUS

PDF

77.1 KB Created: 2021-04-04 05:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffbee6e0c3cc862ea99871a0809cbf2a SHA-1: 7daef4cd8d8e487a8cb52fcbbe42a5b8c304b5d6 SHA-256: b8132e176d2e0208e3086c6cc1e05becafe24b725bc4f26dff11d9439ce383d0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. The PDF contains a large number of external links, forming a link farm, with one prominent URL pointing to 'xajibur.ru'. This suggests a phishing or SEO poisoning attack, aiming to direct users to potentially malicious or unwanted content. No scripts were extracted, but the presence of numerous external links indicates a likely attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://xajibur.ru/award?keyword=aromaterapia+aceites+esenciales+propiedades+pdf
    • https://cdn.sqhk.co/letarezetap/Gijjhq7/vepoxonojimugapotap.pdf
    • https://cdn.sqhk.co/dodipenameki/bgdhfja/49448546659.pdf
    • http://alania365.ru/holy_quran_with_bangla_pronunciationpbakw.pdf
    • https://cdn.sqhk.co/busoleva/0GRwqcB/lazeke.pdf
    • http://topstop.site/38556329676n2gc8.pdf
    • https://cdn.sqhk.co/reromiwo/jfgdSiE/picsart_photo_studio_collage_maker_and_pic_editor.pdf
    • http://lolkek.xyz/falidipuvukijiyula.pdf
    • http://goo-y.xyz/bijewazuac6oh.pdf
    • https://cdn.sqhk.co/jebixusugak/wWgihi9/popular_hashtags_today_facebook.pdf
    • https://cdn.sqhk.co/viwedanej/algg1je/free_music_apps_for_iphone_11.pdf
    • https://cdn.sqhk.co/wadusazilox/VFrgezV/28210487385.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/sazariwapa/what_is_e1_error_in_voltas_ac.pdf
    • https://s3.amazonaws.com/topipovikapari/bharat_full_movie_filmywap.pdf
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_15f9595d352d4d23a245ed6ee226394c.pdf?index=true
    • https://s3.amazonaws.com/bofake/the_landlady_analysis_sparknotes.pdf
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_2922b5066233456db79d0503173f3c01.pdf?index=true
    • https://s3.amazonaws.com/gotijejaj/equalizer_bass_booster_pro_apk_latest.pdf
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_d7f0817898104c90a222c8623c3fd9ba.pdf?index=true
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_c16a157778774ce9af2dd68dac24da34.pdf?index=true
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_a34e1f9bc9074e56b582e7d9ab326db9.pdf?index=true
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_aa7f7ffc13a84e51ad442ce04836ef45.pdf?index=true
    • https://1794ee33-230d-455b-98b1-84d48067edce.filesusr.com/ugd/551769_a79d64e90999409daa01632a762efd79.pdf?index=true
    • https://s3.amazonaws.com/zamuriza/30_day_notice_template_for_tenant.pdf
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_2c67a50d558d4a50b2c6c9ca100f30c7.pdf?index=true
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_0f4e716589d340dbafcc300b6444de7c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e07a.bin
12ab11e59f877ac4bd7359aa49289adf1a79f27b952cb243f8e9a070d97e7f02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 5076 bytes
font_01_sfnt_off0000f194.bin
d120ab2533f001da1e2a6c8274908201320c28a636ec261d92c8525d09017eca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 11384 bytes
font_02_sfnt_off00011679.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11679 4324 bytes

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