Malicious PDF — malware analysis report

Static analysis result for SHA-256 757ecdddba980a36…

MALICIOUS

PDF

80.0 KB Created: 2021-04-24 09:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 617afd0c2f6060fc1885deab79b7df8b SHA-1: 18b974fd98f659c884e4e6d5a3f34dc0c8715503 SHA-256: 757ecdddba980a36527d20365d348c51a3006dae12890fdb3693f070b85a27c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://jacksth.ru/strik?utm_term=why+does+my+gas+fireplace+not+start PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491670/normal_5fe6e46b3b38d.pdfIn PDF document text
    • http://mavogevuz.getenjoyment.net/arun_sharma_cat_books_data_interpretation.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/drdo_ceptam_9_a_a_syllabus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_60590740a5ea1.pdfIn PDF document text
    • http://zufonedisogaj.iblogger.org/engineering_mechanics_statics_14th_edition_by_hibbeler.pdfIn PDF document text
    • http://fosireditoj.mygamesonline.org/renewable_energy_in_buildings.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381347/normal_5fe7993703032.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417123/normal_5fff79dc4c5b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zurovajij/silazomef.pdfIn PDF document text
    • http://sakigekoxigukil.epizy.com/32493424774.pdfIn PDF document text
    • http://nigukeja.epizy.com/chrono_trigger_android_apk_free.pdfIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_c095058cb96845c797c3bbea3bc77e0b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/lokudufasajodebetubuwa.pdfIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_5b266d390865417a9f2b2ba906031539.pdf?index=trueIn PDF document text
    • http://nifukugobu.rf.gd/8489022405.pdfIn PDF document text
    • http://tafituza.rf.gd/manual_arduino_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/how_to_reset_xfinity_xr2_remote.pdfIn PDF document text
    • http://toponetivipabar.rf.gd/2001119233.pdfIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_35abf34d04214954b14029a8d6fc459b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/96092659488.pdfIn PDF document text
    • http://gajutar.onlinewebshop.net/66707160750.pdfIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_27ce1004acc149bcb9ca02e49975d37f.pdf?index=trueIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_1bb1d2f1b10a4bd3b04203925bd4009f.pdf?index=trueIn PDF document text
    • http://tifuximixadove.rf.gd/brucellose_humaine.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_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 5684 bytes
SHA-256: dd16d3fc72a935c0536b403d7acf3915cd2b366fab9f9689a456c6c821630f87
font_01_sfnt_off00010cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD9 11212 bytes
SHA-256: 06756733743d540e1f985ed247049d1687e3c9976b0cd3d558a2c0667355eb36