Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99617e24244041c…

MALICIOUS

PDF

76.2 KB Created: 2021-06-04 01:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0abd77c9bed19ceb509cb3aa2abe1ba2 SHA-1: d0881df9a40409da4c7889a6535e0f3084933c70 SHA-256: f99617e24244041caa0725d61993a7402c835104b4f6e380cda5b4c291bbc53d
186 Risk Score

Malware Insights

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

The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to solicit sensitive recovery secrets or private keys from the user. This, combined with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of an external URI pointing to a suspicious domain, strongly suggests a phishing attack. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://maypoin.ru/123?utm_term=avg+antivirus+for+windows+7+ultimate
    • https://cdn-cms.f-static.net/uploads/4388833/normal_6060028d26f0a.pdf
    • https://pizakatunif.weebly.com/uploads/1/3/1/8/131856177/xosoxa-kapefegabij.pdf
    • https://xuniwinasifobip.weebly.com/uploads/1/3/5/3/135302293/petuzakuzuta_nexag.pdf
    • https://static.s123-cdn-static.com/uploads/4503533/normal_5ff7e1f321196.pdf
    • https://ruwaxejitoxa.weebly.com/uploads/1/3/4/9/134902813/jurazibose-dodeguwas-mopekexodegu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xumefosux.pbworks.com/f/how_to_install_220v_outlet_for_car_charger.pdf
    • http://jitilabajeko.pbworks.com/f/marvel_spider-man_ps4_iso_file_download.pdf
    • http://wiwudoje.pbworks.com/w/file/fetch/144536742/6105528224.pdf
    • http://xojifot.pbworks.com/w/file/fetch/144413610/periodic_table_of_elements_symbols_and_names_quiz.pdf
    • http://bamedun.pbworks.com/f/does_nissan_juke_acenta_have_parking_sensors.pdf
    • https://uploads.strikinglycdn.com/files/ddb883ea-dd79-4a65-89cf-ca18dcb18527/tarebosapobobozugekado.pdf
    • https://uploads.strikinglycdn.com/files/ed837414-409c-4c3e-bb96-d0ec6b4e6590/53238559249.pdf
    • https://uploads.strikinglycdn.com/files/e2329798-e7c8-4efd-b8b8-ae09ba744350/navy_e5_eval_dates.pdf
    • http://maxasol.pbworks.com/f/12048087899.pdf
    • http://sejiliki.pbworks.com/w/file/fetch/144575277/can_you_log_into_venmo_with_paypal.pdf
    • http://nadupodifado.pbworks.com/w/file/fetch/144448038/sovesododu.pdf
    • https://uploads.strikinglycdn.com/files/e1105ccc-7138-4f31-8321-b590d2857edc/what_are_facebook_recovery_codes.pdf
    • http://tazijebep.pbworks.com/f/exercice_pythagore_3me_brevet_avec_correction.pdf
    • http://pusavivo.pbworks.com/w/file/fetch/144555684/97584798809.pdf
    • http://wenitudodub.pbworks.com/f/mabebetalepapo.pdf
    • http://sozakuvepar.pbworks.com/f/how_to_download_google_docs_on_pc.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb3.bin
4d7170b0819bf2d231055ca1ee8f81173e887b22d397ad78b68a29cb22529f82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 5448 bytes
font_01_sfnt_off0000ff49.bin
e78ce344396629dd0da8508f5193cce5ce6225bb9c7c37b3fe9bafe339c0ccea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF49 10764 bytes

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