Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5217c3fb6d9dc01…

MALICIOUS

PDF

74.9 KB Created: 2021-04-08 17:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d59355b1141f5df8c69b434c1bbfa9f7 SHA-1: d76878d5178d0c5c0a2989d9f6ba7be5f71af031 SHA-256: c5217c3fb6d9dc0124cf8726dfb6cc317fb995a3900558dc709a49d8151990f7
186 Risk Score

Malware Insights

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

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 0.9989

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 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.
  • 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://mezovuduw.ru/strik?utm_term=toro+20016+air+filter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467581/normal_60489bfab2270.pdfIn PDF document text
    • http://dunodipike.sportsontheweb.net/tekog.pdfIn PDF document text
    • http://kernig.store/logo_quiz_game_online_free1fvoi.pdfIn PDF document text
    • http://fajamad.mypressonline.com/bifedilimaluzupunamavak.pdfIn PDF document text
    • http://globalsafegroup.com/62257607412bgd0l.pdfIn PDF document text
    • http://vexasefagi.scienceontheweb.net/conversin_pulgadas_a_cm_tv.pdfIn PDF document text
    • http://suraneb.scienceontheweb.net/bunilexitezokupovuzarixeg.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/kumegasoni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455374/normal_603e2b9866211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464323/normal_603bc685b8c7e.pdfIn PDF document text
    • http://look-hotel.com/excel_vba_assign_range_values_to_arrayahfp3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382643/normal_5ffb61c34ace2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375886/normal_6034c0683183f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465565/normal_60350c77f0b60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449769/normal_5ff8c6551e9d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371800/normal_60466c1bd10b1.pdfIn PDF document text
    • http://islemleriniz.org/how_do_i_setup_my_apple_airport_as_a_wifi_extenderwaey6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393019/normal_60375abf34589.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_620f15279d19492ab0b8986397be0d69.pdf?index=trueIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_ddd846ffad694a8c98861bbd74959957.pdf?index=trueIn PDF document text
    • http://zujakogi.onlinewebshop.net/64865407036.pdfIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_e534a61cb3dc462bbd4283edbc43c2cd.pdf?index=trueIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_45b0916310d94ac48743c395312a628c.pdf?index=trueIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_b9e6a4d4d8304832ad722b7603a636c7.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 4692 bytes
SHA-256: 03f19248d872cfef1922c5df0b092b60294620a39bcd74a698353232ed718ee5
font_01_sfnt_off0000e93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 11752 bytes
SHA-256: df5bb92b550cb209776c447150566285e049ebdb58104e32588b21acba970005
font_02_sfnt_off00011067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11067 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3