Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd97b6c5ef58aea…

MALICIOUS

PDF

68.2 KB Created: 2021-04-07 12:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6108a1551c632bb07feea0736a69cb04 SHA-1: 20e135186c981198dc4ab7af60c60d46086eeb86 SHA-256: fcd97b6c5ef58aea51efc04e769ec859ccd87ffa8c409de8e8a5ccffbe1ed706
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://xezojetit.ru/123?utm_term=achtung+die+kurve++pc PDF link annotation
    • http://mosquito.codes/nululutivekugimewixupipb1p7.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/fresno_city_college_campus_map.pdfIn PDF document text
    • http://sozimaxetupow.mywebcommunity.org/catia_documentation.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/cultures_of_the_west_a_history_volume_2_since_1350.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369522/normal_60254576b7d94.pdfIn PDF document text
    • http://antileqphh.site/91841328323n6yrw.pdfIn PDF document text
    • http://fazupefejivujuf.iblogger.org/anemia_de_celulas_falciformes_2020.pdfIn PDF document text
    • http://glossywp.online/ecers_3_book65jvj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450728/normal_60550f4c4ff6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466366/normal_6046754b48db1.pdfIn PDF document text
    • http://datiwufirul.medianewsonline.com/tozugilegosagevunegud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bokepomi.onlinewebshop.net/algebra_solving_equations.pdfIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_b03198369a0f48df8bc8521ff40568fe.pdf?index=trueIn PDF document text
    • http://fuwutowamig.myartsonline.com/blank_coupon_template_free.pdfIn PDF document text
    • http://livirava.atwebpages.com/history_alive_online_login.pdfIn PDF document text
    • http://wafogaz.rf.gd/linear_systems_word_problems_worksheet.pdfIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_fceb06d6e1cc4929ab6e5e19093e7ee2.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_06d0f884f1b6400ca5f6489b2cac14bf.pdf?index=trueIn 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_off0000cd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD59 5028 bytes
SHA-256: 5d42848de4c11681211965ddf525c5913a968b3ed67d78c31a6c0db60558c778
font_01_sfnt_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 11296 bytes
SHA-256: 5ed69dcb93a9ab4e41df7d6f49404041d6cf294997bb76c3146fd39c37604b95

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