Malicious PDF — malware analysis report

Static analysis result for SHA-256 6137953b5bcb7ef7…

MALICIOUS

PDF

83.8 KB Created: 2021-04-03 22:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9652f2a198d56bf4da347e9ada806673 SHA-1: fb063415aa85561c695859bbb59a010690629c5b SHA-256: 6137953b5bcb7ef7b28cfe8cd462e7735d5533e845236d535524c69f0eff66d7
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many of which point to disposable hosting services and appear to be part of a link farm designed to redirect users. The presence of these URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://vilenefex.ru/123?utm_term=guardian+university+guide+league+tables+2017 PDF link annotation
    • https://kadezejuvi.weebly.com/uploads/1/3/4/6/134603763/d0fa3.pdfIn PDF document text
    • http://fito4ka.xyz/71952374039mdnbi.pdfIn PDF document text
    • https://kelezisexuva.weebly.com/uploads/1/3/0/7/130739204/kuxomelod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369504/normal_6052831d537ce.pdfIn PDF document text
    • http://pinerapidsrr.com/ultimate_guide_to_minecraft67d8r.pdfIn PDF document text
    • http://meetporte.xyz/computer_pc_antivirus_software2zz2l.pdfIn PDF document text
    • http://lovelyhouse.online/what_are_the_5_yamas_and_niyamasxp8co.pdfIn PDF document text
    • http://wordwild-store.com/livideroc1bz1.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/can_you_return_open_box_items_to_targetvultk.pdfIn PDF document text
    • http://sodalabs.club/bumufitapofonir6j2za.pdfIn PDF document text
    • https://xufujume.weebly.com/uploads/1/3/4/8/134851049/d1e81.pdfIn PDF document text
    • http://sodahub.pro/hola_vpn_for_laptopeiieh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478952/normal_606820291652a.pdfIn PDF document text
    • http://pogadai.xyz/225727299600q25f.pdfIn PDF document text
    • http://espaceclient-cmb.com/digilunowelobojodafezuxir90jbq.pdfIn PDF document text
    • http://flowerport.shop/medea_play_by_euripides_summary244ee.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/40200361468l8ev2.pdfIn PDF document text
    • http://basvuruizleme.online/home_depot_patio_furniture_assemblyzgw2o.pdfIn PDF document text
    • https://patobusogeziwe.weebly.com/uploads/1/3/4/0/134096506/folekuturigoli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401515/normal_5fe242777dd2e.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/munchkin_no_cards_in_handa0iyj.pdfIn PDF document text
    • http://glasshookahcatering.com/fesujujumibawew6w6ez.pdfIn PDF document text
    • http://qwertyujg.xyz/academy_stars_3_pupil_s_book5a722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457302/normal_601f0d4f11d7b.pdfIn PDF document text
    • https://xivunububan.weebly.com/uploads/1/3/0/9/130969166/gizarilaxa-jutiginad.pdfIn PDF document text
    • http://relax35.ru/sap_joint_venture_accounting_booktdv27.pdfIn PDF document text
    • http://shoes-storie.club/honors_precalculus_completing_the_square_worksheet_answersaige7.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
    • 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_off0000fbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF4 5504 bytes
SHA-256: cd04bdf62255d122419f4dbaff75863c182a5ee67cfe95b086a1525356bf9c47
font_01_sfnt_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 10628 bytes
SHA-256: 95faf738e3c76afd10addd68c4de99ae754cf9f44913901b7fb4d53baca8dcfa
font_02_sfnt_off000132f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F6 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378