Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf31e922779f7152…

MALICIOUS

PDF

87.0 KB Created: 2021-05-01 09:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: df489cd447121b9b74a982affc82b4d6 SHA-1: dfc0823390f4a83e4462d0dbc2983245dc557e94 SHA-256: cf31e922779f71525179710e55f585c1ea40afccc357b3de2e8761dca4f2fd54
224 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://yafferge.ru/strik?utm_term=descargar+zelda+ocarina+of+time+3ds+rom+citra In PDF document text
    • https://cdn.sqhk.co/fujonexa/clMobji/most_accurate_bowling_app.pdfIn PDF document text
    • https://cdn.sqhk.co/lamajemomu/ghbXfhc/murder_mystery_2_codes_august_2020.pdfIn PDF document text
    • http://vukufitu.mywebcommunity.org/bsc_physical_chemistry_practical_book.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/jdf38zG/extreme_tux_racer.pdfIn PDF document text
    • http://xitemomide.22web.org/exerccios_tabela_peridica_9o_ano.pdfIn PDF document text
    • https://cdn.sqhk.co/tujujelo/gcjfFtL/75534223891.pdfIn PDF document text
    • http://torixobo.mypressonline.com/94501160972.pdfIn PDF document text
    • http://wijofotezopadik.medianewsonline.com/cisco_csr_1000v_ovf_download.pdfIn PDF document text
    • http://mumopajikex.mygamesonline.org/spell_check_mac.pdfIn PDF document text
    • http://zigapajuxijado.mywebcommunity.org/49840021294.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/piwomimemag.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/d4CFMih/94012863591.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/selivuvumepaveb/miss_peregrine_home_for_peculiar_movie_hindi_dubbed_download_480p.pdfIn PDF document text
    • http://xijuroluzuka.epizy.com/damikom.pdfIn PDF document text
    • http://nifiwirijapokaf.rf.gd/798765953.pdfIn PDF document text
    • http://runuwug.myartsonline.com/stihl_battery_blower_home_depot.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/bizadogofeleruxes.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/focusrite_scarlett_solo_studio_pack_g2.pdfIn PDF document text
    • http://jimibidubarabus.epizy.com/middle_adulthood_physical_development.pdfIn PDF document text
    • http://pivimufe.atwebpages.com/theological_stage.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 5552 bytes
SHA-256: 57333df366cf809289b9b1f1980455bbc7befabf5a472d79d7ae2aacbb1cc18f
font_01_sfnt_off000109e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 12628 bytes
SHA-256: 081b35a32da1c5536d522a5ae43fc0c8a66aba56d11ca1573194e28aef355802
font_02_sfnt_off0001329a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329A 17372 bytes
SHA-256: e71278a2a7ed82555269cf8cf16d027585fd94e01105c716cb70516f8f123210