Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ae444bcfa5c7c9…

MALICIOUS

PDF

85.7 KB Created: 2021-03-16 07:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89c080b1d3253648cfa0e2b717111db1 SHA-1: d6ee5c27df8c61ac14acf40e5fc3ddc38237b5a1 SHA-256: 23ae444bcfa5c7c996ba31f25741386625245081830356c500b37e280e5125f5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' and another flagging it as an 'SE_ADVANCE_FEE_SCAM_LURE'. The ClamAV detection and ML classifier further support its malicious nature. The embedded URLs suggest an attempt to redirect the user to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://bologen.ru/123?utm_term=clash+royale+update+apk+2019
    • http://life50it.pro/55236387162gj6ua.pdf
    • http://gta-msk.ru/aga_khan_university_hospital_lab_reports_onlineguvxx.pdf
    • http://ravigimojamel.mypressonline.com/best_agatha_christie_books_for_young_readers.pdf
    • http://reduslim-shop.website/44188925268jnpcw.pdf
    • http://goproits.com/que_tamao_es_foto_carnetzkpqt.pdf
    • http://pufivuziviv.mypressonline.com/lexirotinilemer.pdf
    • http://ridunculus.com/wepinifozbsxv9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_146bc7bde2d34a86a0a814eaa4627c87.pdf?index=true
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_5234e2bec7434b949d4398c108f096cf.pdf?index=true
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_2ef546632ef44e7da4c6d41349940fe1.pdf?index=true
    • https://s3.amazonaws.com/petubapizo/70632979566.pdf
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_c6b976a2eefe4ad8b122004b3ac781f6.pdf?index=true
    • http://lawaxisagiwog.atwebpages.com/brimstone_angels_series.pdf
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_4104601250654a2aa3c869f63413e0fd.pdf?index=true
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_399dc7dcfad941cabc03ace2a7d29058.pdf?index=true
    • http://sebokegekesuded.atwebpages.com/woxevejuxodemapuwomu.pdf
    • https://s3.amazonaws.com/wizitifowubux/list_of_2nd_edition_add_books.pdf
    • https://s3.amazonaws.com/mivokozibu/sosere.pdf
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_db5bf99e0eeb40cfb4a19707dd67285e.pdf?index=true
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_40a30c22cab94f6faa78e3ef4c199d7d.pdf?index=true
    • https://s3.amazonaws.com/jagux/kubufatizuzu.pdf
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_a433e5a7ce21498ebf58cf89350f874f.pdf?index=true
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_ca1692dcbcd54fc28e943fd868033002.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f922.bin
1220a8786f658f366ef4ab10e1ca17ad40e9e6fe6de388a4487e03a3e520ea87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 5600 bytes
font_01_sfnt_off00010c28.bin
eeecd6ff26002df4898b2d0fbf753f3895f2eebcd2e76f10c719eb2ee7df01f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C28 11148 bytes
font_02_sfnt_off00013224.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13224 16204 bytes

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