Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7fd38e2c34c85a…

MALICIOUS

PDF

80.2 KB Created: 2021-04-03 16:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9fd37d782144d8fb31eb39f385d4d9d0 SHA-1: e081e4d2e9c192aec04e012661254e54e1743ee4 SHA-256: 6c7fd38e2c34c85acc167aa2fef47bef5e0e4a1ba38b4f9174ea3ce615b94d6f
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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/strik?utm_term=are+dna+tests+100+accurate PDF link annotation
    • https://cdn.sqhk.co/vuveleni/byjjfgg/whatsapp_sticker_maker_online_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/raxinosi/giiidtn/edjing_mix_mod_apk_download.pdfIn PDF document text
    • http://reawolt.online/4830436694w03ip.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/hbKdjfn/nizefitobivan.pdfIn PDF document text
    • http://poroda.site/rokebazodixexegut3foea.pdfIn PDF document text
    • http://katermore.ru/297844793242p2y0.pdfIn PDF document text
    • http://s7hmus.org/zedomagoo2w06.pdfIn PDF document text
    • http://olymp-trade.top/apple_next_earnings_report_2019bt1v8.pdfIn PDF document text
    • http://ruwemipuwev.mypressonline.com/zejizafujizusev.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/jj7UPXX/13885231367.pdfIn PDF document text
    • http://gatofupimekow.mywebcommunity.org/sebovurabupororemefo.pdfIn PDF document text
    • https://cdn.sqhk.co/godezixibufo/YifCif2/31476883126.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joxumokuri.epizy.com/jinejufirezuwozef.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/calculus_limits_worksheet_with_solutions.pdfIn PDF document text
    • http://jirikefo.epizy.com/gazexorozejuxiv.pdfIn PDF document text
    • http://gugakalorezo.epizy.com/60687269762.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/como_rezar_la_corona_de_adviento_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/lan_cable_color_code_function.pdfIn PDF document text
    • http://gekolutewubel.myartsonline.com/aptis_test_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/kikugipalijezurelada.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/agente_naranja.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/nulopedoparimi.pdfIn PDF document text
    • http://keviful.epizy.com/rugozew.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/51819818989.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_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 5084 bytes
SHA-256: 2febb8b385d7f6b874ca898da7319a4d02cfe49d7b45d00455cf419453ea0747
font_01_sfnt_off000102e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E4 2116 bytes
SHA-256: 8db65adc699bed2ed4e99b174e414cace916d9ae25f4e5597e3d94de4d1667c8
font_02_sfnt_off00010c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 10916 bytes
SHA-256: 5547bc278cc08394433535f830f2ab59817898b6671ff989b3eb005648ba0924

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