Malicious PDF — malware analysis report

Static analysis result for SHA-256 319efdd2170e773e…

MALICIOUS

PDF

80.9 KB Created: 2021-05-11 03:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 08b86bc7993f7416248b272de3021f91 SHA-1: 61540b1311033b4301859ce8c875c32a89f295fb SHA-256: 319efdd2170e773e6ccaa9b4d53630ff090eeaa74295246b85b77a0858a75237
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains a reference to 'Hunger games mockingjay book vs movie', likely a lure to attract clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=hunger+games+mockingjay+book+vs+movie PDF link annotation
    • http://guzoseta.getenjoyment.net/tizuler.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/aiejhic/idle_inn_tycoon_double_room.pdfIn PDF document text
    • https://cdn.sqhk.co/dediwifime/jvjcpig/pixufezamakagudazaru.pdfIn PDF document text
    • https://cdn.sqhk.co/sobutexe/fYdiAic/h_m_interview_questions_and_answers_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/vusabutam/7bCOiir/pidamowujijukizego.pdfIn PDF document text
    • http://bukawavado.medianewsonline.com/paradise_lost_free.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/40879910330.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/hiSjfie/red_rose_movie_2016_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/cg9gfGY/horatio_hornblower_book_series.pdfIn PDF document text
    • http://vuwagumewaga.iblogger.org/rezivatupuzatuloxogetopuv.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/Giagihg/79465467337.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/IQQxge2/atf_box_installer.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/nelizenejakarug/vajet.pdfIn PDF document text
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_192a203ab6e646b5982ea7411c5cc15b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/pesuturopogijis.pdfIn PDF document text
    • http://fudotebu.epizy.com/astm_a36_gratis.pdfIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_c772bd89a0bf4f0fb15099d9959e16e7.pdf?index=trueIn PDF document text
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_10e928482bcf4062a57fb50054c0d584.pdf?index=trueIn PDF document text
    • http://piwakitidi.onlinewebshop.net/telecharger_dictionnaire_anglais_franais_larousse.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/57850068228.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/cnet_s_windows.pdfIn PDF document text
    • http://nudoritane.atwebpages.com/sekevemosotudalevipajenej.pdfIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_5362c87b0c0247bb98b0e87cccd2a66d.pdf?index=trueIn PDF document text
    • http://gabatotudam.rf.gd/bari_sax_finger_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/boss_jass_manak_song_tinyjuke.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_off0000fefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFD 5488 bytes
SHA-256: 7052455a0978c697a956a7e46399c12e3389cd13e80ec075b1bd05c47589fe65
font_01_sfnt_off000111af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 10680 bytes
SHA-256: c8988e249c0879f25b361accbbf68bf8d2ee35f76b99cb7f439fdbf9886cb0ac