Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8e7477920a6c5f…

MALICIOUS

PDF

73.3 KB Created: 2021-02-20 23:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d90b4e08ddeed99b72734dd83612566d SHA-1: 8aeea45274dbff15ec0371496a11e866f5555c7b SHA-256: 3e8e7477920a6c5fe964856ee1ba0f147156f77500ab9a5c093717b702c57786
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and flagged as link farms. The primary URL, 'https://jacksth.ru/strik?utm_term=why+is+the+hunger+games+on+the+banned+book+list', suggests a phishing or malicious content lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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+is+the+hunger+games+on+the+banned+book+list PDF link annotation
    • https://cdn.sqhk.co/runenuti/j4jhgh0/52381441795.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/jb4hJQ4/rejudaparuzakamuw.pdfIn PDF document text
    • https://cdn.sqhk.co/lijusute/jdjaqte/easy_nails_gel.pdfIn PDF document text
    • http://bigops.fun/hackintosh_gitbook_vanilla_desktop_guide0zil4.pdfIn PDF document text
    • https://cdn.sqhk.co/xejexeremiso/NZI6hfN/kemikosax.pdfIn PDF document text
    • http://jalukilesojed.22web.org/research_proposal_on_agricultural_economics.pdfIn PDF document text
    • http://dithetsen.xyz/55410788459clgic.pdfIn PDF document text
    • http://mukedasimewiri.22web.org/relulopixonegane.pdfIn PDF document text
    • https://cdn.sqhk.co/kizusuvut/W9mEjh0/duxuzetuwini.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/gcs49QB/dark_legends_pack_yugioh.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/iAiahbk/how_to_play_online_games_offline_on_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/disonixures/2Nl7jtJ/dituzazevitimebimot.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/qRqqgfX/84862903671.pdfIn PDF document text
    • http://pepujolajerikur.66ghz.com/kurekavarekupiz.pdfIn PDF document text
    • http://nonly.xyz/how_to_test_a_furnace_sequencer48chn.pdfIn PDF document text
    • http://kulinar2020.site/gods_of_egypt_movie_downloadum1o4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dajaxul.epizy.com/what_is_the_red_queen_about.pdfIn PDF document text
    • http://rivebop.epizy.com/brisbane_city_council_parking_permit_form.pdfIn PDF document text
    • http://zojexajori.epizy.com/bokebowunatut.pdfIn PDF document text
    • http://jomozaredid.rf.gd/performance_bond_and_bid_bond.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_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 5556 bytes
SHA-256: 7800289af89eb71e809edff65d1bcfa8b75462462ced3c57fad7799f35027777
font_01_sfnt_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 10532 bytes
SHA-256: fed8b4afc445f93f6e42a75e9cf07938af6f8eb4a60a45c7af842e90bc88305a

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