Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7215d981944c25…

MALICIOUS

PDF

74.1 KB Created: 2021-03-26 04:45:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a1b3b20d8fd6123d192f10e341e37cc1 SHA-1: e8b38ebb16fe53f1d7a1070114a6ec6e275c8c6e SHA-256: ae7215d981944c255a64c8b5d0c0f4a9b1aaeb10411fcdeb09f842dc1131b9f6
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9997

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://zajinet.ru/wix?keyword=piggy+boom+hack+online+generator PDF link annotation
    • http://dosefokinuvulo.mypressonline.com/download_google_books_free_format_online.pdfIn PDF document text
    • http://raboleziwuga.iblogger.org/hemangioma_capilar_orbitario.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/79949267202.pdfIn PDF document text
    • http://jawogili.22web.org/how_to_select_the_appropriate_target_market_segment.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/10892478532.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kemesid.onlinewebshop.net/caida_del_imperio_romano_occidente.pdfIn PDF document text
    • http://dajomilot.atwebpages.com/xijejipasobow.pdfIn PDF document text
    • http://jopewadakos.epizy.com/digiveroxupokedovatubabik.pdfIn PDF document text
    • http://wuwopeluba.epizy.com/unix_for_dummies_free_download_slideshare.pdfIn PDF document text
    • http://muguvap.epizy.com/imf_report_world_economic_outlook_2019.pdfIn PDF document text
    • http://zolusodo.epizy.com/maluwovobibe.pdfIn PDF document text
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_a00e2185540942f2b8c8ce33fa3434c7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xesigeze/bosaju.pdfIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_167f417c5c6d4b399d8f11d4141eccf8.pdf?index=trueIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_ee0ec49da3e84f41bc7631db52430b5b.pdf?index=trueIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_cc100c963dae4432b6d54c2b26166a1e.pdf?index=trueIn PDF document text
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_bb7e688bfc6346de9515d02b6e070d11.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_bdd84583a1f049b7ab4485de52baae58.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/horry_county_police_reports_online.pdfIn PDF document text
    • http://jobifizokugo.rf.gd/esc_guidelines_revascularization_2018_ppt.pdfIn PDF document text
    • https://peatix.com/user/2938150/viewIn 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_off0000e5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 5344 bytes
SHA-256: 160adb32413ecaceedc5b7b2681659296a5e7e592419874b790678d9ba9553d7
font_01_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 10360 bytes
SHA-256: 0806a6e534c601d1923736cef200ff9049c4890fe68811ffd07096fa99e8bcae

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