Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd5aa59670fc52b…

MALICIOUS

PDF

78.4 KB Created: 2021-04-01 18:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3274ab8b93a2c79bc0e2165a43f94340 SHA-1: 94ad24d2fbfeac13b70bd4458a8e624f1acff6ba SHA-256: ecd5aa59670fc52bd0751c6de6656a78ea0efb3f8cb017041e1e26acb16d9709
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/wix?keyword=mgb+price+guide In PDF document text
    • http://livecopyrightverification.com/watson_goes_to_birmingham_casti2lub.pdfIn PDF document text
    • http://bigowet.xyz/denitozowolagiranivh4ttt.pdfIn PDF document text
    • https://dapodufez.weebly.com/uploads/1/3/3/9/133997146/piwusivuf_memazefufoleni_zisuruporabu.pdfIn PDF document text
    • http://wisecredit.info/microsoft_online_cover_letter_templates1h3zm.pdfIn PDF document text
    • https://panikudar.weebly.com/uploads/1/3/1/4/131437701/50ecc18.pdfIn PDF document text
    • http://cmb-eco.com/components_of_curriculum_designm6nob.pdfIn PDF document text
    • https://berekiba.weebly.com/uploads/1/3/1/4/131482976/2501734.pdfIn PDF document text
    • http://mavisuvegepufi.iblogger.org/world_time_calculator_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/fJgclXg/37574218814.pdfIn PDF document text
    • http://persequenteamsohbet.com/continuum_mechanics_courseraxowk1.pdfIn PDF document text
    • https://cdn.sqhk.co/jotoselu/iahhghS/disney_world_droid_depot_options.pdfIn PDF document text
    • https://cdn.sqhk.co/rukeditele/yjcGiuH/final_fantasy_tactics_advance_jobs_blue_mage.pdfIn PDF document text
    • http://kofuwokesa.22web.org/78797064880.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384029/normal_5ff88bedd8f33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447662/normal_605b6f91334b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411702/normal_604425072df31.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d7351c57-fb88-40c0-8f3b-7dab99ec9f5d/spalding_adjustable_basketball_hoop_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84700bbd-0b36-4110-958b-73c105345b4b/how_to_do_oll_j_perm.pdfIn PDF document text
    • http://rabuwupitakif.rf.gd/set_adapter_fragment_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eedefc1-a076-466a-a569-38d662f5bc26/char-broil_tru_infrared_grates_rusting.pdfIn PDF document text
    • http://nokefibazapowem.rf.gd/5550182478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf2563f7-fea5-414b-9ebf-b5f75fde325f/why_is_my_panasonic_cordless_phone_crackling.pdfIn PDF document text
    • http://lemuguta.rf.gd/7482421370.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 4552 bytes
SHA-256: 4c617e917274ee9c736fa22fbc5e6fd3d322b50516035ae6fb69c085561972a6
font_01_sfnt_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 10832 bytes
SHA-256: a99bc2e2cd24df7a83c6ef2dfa961b0493fa3a16973ab1757dc96f2d2df81461
font_02_sfnt_off00011d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D07 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361