Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed401b81dce099d…

MALICIOUS

PDF

79.7 KB Created: 2021-04-15 00:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c76db25137a48d8922082954d9fa838b SHA-1: 5ec16bc74c4f623f2370312b2ca5bf7bf0815406 SHA-256: fed401b81dce099dd103bb3de3c5b584b04610fb3c5b31b3f9b00ddcad9ef859
252 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to malicious sites, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crophysi.ru/strik?utm_term=moto+g+3rd+gen+price+in+india In PDF document text
    • http://openplafond.xyz/92675133811r4duc.pdfIn PDF document text
    • http://citrus-fruit.space/minority_scholarship_form_2019_jharkhand8d42w.pdfIn PDF document text
    • http://cyberlife.store/34229293219ttgl7.pdfIn PDF document text
    • http://agreevudb.rest/72_nombres_de_dios_kabbalah_significadoiek6b.pdfIn PDF document text
    • https://cdn.sqhk.co/gubujurit/gDgixfO/57348449117.pdfIn PDF document text
    • http://bonmarket.site/71131117571xh7wj.pdfIn PDF document text
    • http://fruktovik.com/20310589190cux8h.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/hdjdhgC/zm_stock_tipranks.pdfIn PDF document text
    • http://gta-msk.ru/pupuzeruxibbhapo.pdfIn PDF document text
    • https://cdn.sqhk.co/tazakabebilo/d8ijTPs/hard_time_prison_sim_apk.pdfIn PDF document text
    • http://torchqbfl.fun/sp_racing_f3_mini_betaflight_gpsbx90w.pdfIn PDF document text
    • https://cdn.sqhk.co/fumediju/YOuMEfv/wokuwafosibewigiga.pdfIn PDF document text
    • http://perevozka.ru/kebogedajafokolakfo8xz.pdfIn PDF document text
    • http://edevletorg.com/jozofipewitajujururakzut.pdfIn PDF document text
    • http://albl.ru/p99_bard_guidegbwsb.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/8af8a92c-210d-44f7-9aea-a91a8a70bbcd/tai_chi_24_form_slow_motion_with_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d55f6f63-2818-4ce1-8106-e9ec770e8b05/axial_scx10_iii_upgrades.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a6c8ae-0c73-4c6f-8c09-90948efa8714/69665291071.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ad1b6df-2d11-4613-bcac-34d9f066ad82/mebod.pdfIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_08f38b81871844f6978ebdae10ca40a8.pdf?index=trueIn PDF document text
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_434ee0c91744477f965e7b09b6a21f3d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e00f5f63-7750-4e59-9d7b-9b3841f071f4/judinaneke.pdfIn PDF document text
    • https://598a1783-db1d-4ebb-96f5-d3ad23e1e090.filesusr.com/ugd/ae99eb_703f205c2b27455cab800bc6717d9c96.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_312154e53cc54405853abd1f233712f7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 4988 bytes
SHA-256: 6cd7d1af905ec8142ffd45e8cc067c6e9c4f0f3ad61dffdad0449eb6715a4e88
font_01_sfnt_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 11500 bytes
SHA-256: 99e4e2b2217018737c352ca6be4a08232b9f4af55760cd6ffb3d11b57e47c9a3
font_02_sfnt_off00012322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12322 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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