Malicious PDF — malware analysis report

Static analysis result for SHA-256 d589d400c6dbd1d3…

MALICIOUS

PDF

89.3 KB Created: 2021-03-12 02:23:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 39cb6d3409415f09696fe177c6793746 SHA-1: 19c9d214e59ee61583266dfeac70c238a053c2fd SHA-256: d589d400c6dbd1d339c5ec5920d40c1f5bf58bee60c80c73760b772b75427d4d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ponafet.ru/strik?utm_term=tai+chi+classic+book PDF link annotation
    • http://instas.site/compare_slingbox_m1_and_m26plom.pdfIn PDF document text
    • http://igme.site/gejepizupippzmq.pdfIn PDF document text
    • http://chaptejvxz.fun/craftsman_190cc_lawn_mower_gold_engine_series2ih0a.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/10511328757.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/aXI0haX/project_management_certification_free_training.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/les_nombres_dcimaux_cm2_exercicesngyff.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/vavojadovabiwaja.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/UjihcwS/xuditamogasokajiveku.pdfIn PDF document text
    • http://xivagoz.22web.org/cheat_sheet_tft_scarra_imgur.pdfIn PDF document text
    • https://cdn.sqhk.co/vegupujed/iRrRcVO/xisotobunevovinolubisumax.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/sjfmhjS/today_s_weather_chicago_tonight.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/cwgfidS/71475778276.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/731441419806e5cj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/141d0387-f656-4b0d-8ef8-9bb9d2c06c60/reading_fingerpicking_tab_ukulele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a54cd1-ea01-4200-8849-97a873a82406/81261427424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/942397c4-a059-4a46-bff6-7080823447a1/gatuvosesofuzen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00b4aee-28dc-4e71-b149-d72e4e60fec1/xelivekonapag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab286a36-3de9-44b7-9da3-52e91622c605/xuvikolusezowuzokux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ea4417-fb2a-42d4-8d7c-9a745d44ff91/depejenelutapulegazaf.pdfIn PDF document text
    • http://tafiwepamubov.atwebpages.com/98784051743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fcfbc16-2842-4b7b-b742-9b064a8310f9/2017_ssr_125_seat_height.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bbdb1f4-f28d-49a2-ae7a-04e8a73cc583/81429513315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9f093ee-092d-4d88-9722-c0c85fd11810/nanobirusujenulopifewupup.pdfIn PDF document text
    • http://fumosuwigerama.epizy.com/temporal_bone_anatomy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c2865da-f87d-4c58-88d9-0e1e67884b9f/dejame_que_te_cuente_libro_tapa_dura.pdfIn PDF document text
    • http://sonasekofuxix.rf.gd/vojopunipamepekilekofar.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_off0000fc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8E 10700 bytes
SHA-256: ea513ae60c859da8adb76fc5a4268b3d83ed5eeb03401d347608648064671949
font_01_sfnt_off00011f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F25 4944 bytes
SHA-256: 3d9e76ac6a0dad7f855138f31ced59719d1563a82da8e6105d32601a4a23b46a
font_02_sfnt_off00012ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF1 11828 bytes
SHA-256: 5a0194c77e8e923042d16799c597998eaf3234679d102370f84820cd464eba5b