Malicious PDF — malware analysis report

Static analysis result for SHA-256 c101218a8923a373…

MALICIOUS

PDF

73.8 KB Created: 2021-05-10 22:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6da8601587b75617df33bc9ed8f1031f SHA-1: 32b2f390da59273b65e20c72258882f0670ae9cc SHA-256: c101218a8923a373662fbf55686edfa19a504be92d80fe12ffeac536061871f5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9999

Heuristics 6

  • 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 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.
  • 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://midufefew.ru/strik?utm_term=what+is+the+kubla+khan+poem+about PDF link annotation
    • http://xexejidabame.22web.org/acog_pap_smear_guidelines_algorithm.pdfIn PDF document text
    • http://jezojarugeboz.22web.org/dead_space_4_free_for_pc.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/40660c92-657a-4813-a2f5-8103db3928f2/greenberg_advanced_engineering_mathematics_solutions.pdfIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_8a00a5b186894fc898cac57bb1525a54.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9209b5b-566b-4a14-8583-7f4c303efa71/what_is_the_average_cost_of_a_water_softener_system.pdfIn PDF document text
    • http://livukizaxavubip.rf.gd/nozeran.pdfIn PDF document text
    • http://xorabaza.rf.gd/crossfit_workout_with_rower_and_barbell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea8d25f4-702d-45d1-9d26-9ff47a9f0c6c/ge_xl44_stove_self_cleaning_instructions.pdfIn PDF document text
    • http://tuwafexom.epizy.com/broken_vessels_sheet_music.pdfIn PDF document text
    • http://gofuxanuwuj.rf.gd/backuptrans_android_whatsapp_to_iphone_transfer_full.pdfIn PDF document text
    • http://bofutezexo.rf.gd/21076935969.pdfIn PDF document text
    • http://puloxivomavari.epizy.com/cb_radio_lingo.pdfIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_e6819359f9214020b5ecedb1a1516cfd.pdf?index=trueIn PDF document text
    • http://tararefegegelel.rf.gd/42048368754.pdfIn PDF document text
    • http://sujetokotew.rf.gd/gewegatuvaziwanuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e8bda3b-028b-48e2-a81c-3b4eaa00adb7/6311796360.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 5180 bytes
SHA-256: f1c16160bf7584dc23951b32aeb068a6488dc4d0f985671b6b52ed7d254d7598
font_01_sfnt_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 10300 bytes
SHA-256: 2d8b0897d201547385399d317c1b99f8adf23f75407c911d6a3f7dc2d19d24ee

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