Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10f0b092d44093a…

MALICIOUS

PDF

71.1 KB Created: 2021-03-20 06:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b04dad07520c0a4eaff9baf94fc2c51a SHA-1: 2060f8fb16ee7b8b9b442c5b7c1cacd7ea846553 SHA-256: d10f0b092d44093a98538abbd9e3d2cec4a1833ced2ddc067e2b02b6f01d78af
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical finding for a link to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=basic+and+clinical+pharmacology+pdf In PDF document text
    • http://mozaduz.mygamesonline.org/vagegigiwipez.pdfIn PDF document text
    • http://palupalukagu.mygamesonline.org/4302468755.pdfIn PDF document text
    • http://kunozoxutokusu.mygamesonline.org/59952490218.pdfIn PDF document text
    • http://copyrighthelpcentral.com/74983936160cn64p.pdfIn PDF document text
    • http://volosaty100.xyz/my_snowblower_keeps_stallingkthlm.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/21a9b9d0-cdde-47fd-92b2-b84260e73ff5/what_does_paper_money_mean_on_thinkorswim.pdfIn PDF document text
    • http://digupekab.rf.gd/barthel_adl_index_20.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb42512-841c-477f-bce4-33a6682ea34f/cessna_150_service_manual.pdfIn PDF document text
    • http://bukemexuladorux.epizy.com/control_systems_theory.pdfIn PDF document text
    • http://puvusevakap.epizy.com/google_spreadsheets_column_width.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5d817bb-d64b-4599-932b-756869914f6d/how_much_is_a_2000_watt_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dce0001e-fa6a-4223-b7da-7a6a52e362ef/poulan_pro_pr4218_18_in._42cc_gas_chainsaw.pdfIn PDF document text
    • http://setovoj.onlinewebshop.net/candlestick_chart_pattern_analysis.pdfIn PDF document text
    • http://bopamebedozupux.epizy.com/basic_classroom_language.pdfIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_212d9c4b0ad345b1ba380c7774e4b9b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd7d87e-a973-4be5-ba73-7be1164b3fd0/fosilekevonasugeku.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_52a090d831bb40d18b716e7f5fca610e.pdf?index=trueIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_94bb8e69801a45f9877f170c3b68c24d.pdf?index=trueIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_84cdda3f2e674c32b9fd399e60a5fbf1.pdf?index=trueIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_928a4bca50e74e9ebfc156e20f115dbf.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_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 5720 bytes
SHA-256: 45e9359e538ad7b26871391d0759c216726f0c06f8ba3a19b8b00340678809d4
font_01_sfnt_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 10544 bytes
SHA-256: 949a30a69b676432a9cf4b4bc31e7b4e871cb8888cd01b7382c972609932021c

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