Malicious PDF — malware analysis report

Static analysis result for SHA-256 88824a94f0b09b67…

MALICIOUS

PDF

73.2 KB Created: 2021-03-16 09:18:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6271aeb49a004b8b379c43f472f155a8 SHA-1: e8928313752be174a73247e58a429507709f698b SHA-256: 88824a94f0b09b67b7e3b7e8209fe6315be4dd29fa5c499252801c696446624e
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting, and one specific URL, 'https://resalured.ru/123?utm_term=annexure+111+form+6', is flagged as an external URI. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a link farm designed for malicious purposes. The document body, though heavily obfuscated, contains references to 'Annexure 111 form 6', likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://resalured.ru/123?utm_term=annexure+111+form+6
    • http://wuxetij.mypressonline.com/opportunity_analysis_canvas_free_download.pdf
    • http://medyahanem.com/notepad_plugin_manager_1._4._5takaf.pdf
    • http://fastgetme.online/97351043680his4n.pdf
    • http://neuroncraft.online/lebinowadagibetefusojg3la6.pdf
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/girl_x_battlexskxp.pdf
    • http://tejasatobes.medianewsonline.com/kixijuwawomebirabajuweli.pdf
    • http://familyit.pro/what_is_a_good_size_pressure_washer_for_home_use2xxwq.pdf
    • http://particulier-societegenerale.xyz/1823829984a7926.pdf
    • http://penageli.getenjoyment.net/the_american_scholar_ralph_waldo_emerson.pdf
    • http://nigavereke.mygamesonline.org/bebisozitij.pdf
    • http://leafester.online/53342684588mukpl.pdf
    • http://bikokobolo.sportsontheweb.net/disadvantages_of_marketing_information_system.pdf
    • http://artelamp.store/cuantos_decimetros_tiene_un_metro_cubicoqd9fa.pdf
    • http://idealsit.fun/why_does_my_freezer_work_but_not_fridgesbogf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fubavinexazixo.onlinewebshop.net/42897205077.pdf
    • https://s3.amazonaws.com/sojebelevenex/toxunulumowetuxezatul.pdf
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_914f1142ba9c4ccf816a5d70f735f8b3.pdf?index=true
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_f687551f9762458db1e28a296d9c240e.pdf?index=true
    • https://s3.amazonaws.com/nitidadufetenu/xakepelekikimekawi.pdf
    • https://s3.amazonaws.com/feseni/jio_phone_mein_bhojpuri_song.pdf
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_7ac61cad3a08430db14432b47e0a6b83.pdf?index=true
    • https://s3.amazonaws.com/sefabe/anaconda_4_full_movie.pdf
    • http://sidepojedava.myartsonline.com/dugamizesavere.pdf
    • http://zijedan.atwebpages.com/96468333275.pdf
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_1ea84b5742c443e5bff9f38a0f30f8f2.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_off0000d448.bin
29efa5be20f4df6f82fcecafc1759ab165f67861533c4842939d6f438551ac92
pdf-font-stream PDF embedded font (sfnt) at offset 0xD448 4508 bytes
font_01_sfnt_off0000e380.bin
a97ce09bbabde534c7508a370e8b34ed506fa314f68b3e710f640b93b44eb6b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 10660 bytes
font_02_sfnt_off000107d9.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 4324 bytes