Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb38b499427306c…

MALICIOUS

PDF

82.4 KB Created: 2021-03-28 17:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65dbd4f7e55bc2a91eeb798e9ecd4d34 SHA-1: bb3026c96868b57d95c1f1bea1fbb1f344cfd13c SHA-256: bcb38b499427306c0844db71351e7d5d538d550bd1cd5f5116b2ced1d134b713
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the presence of external URLs and the nature of the heuristics point towards a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jumiwimov.ru/wix?keyword=columbia+county+waste+dump
    • http://rezanufeku.mygamesonline.org/fallout_4_ps4_tips_and_cheats.pdf
    • http://fagilef.getenjoyment.net/donufolonul.pdf
    • http://pugisapi.mypressonline.com/wajujowunakuzuledire.pdf
    • http://tuwasukam.getenjoyment.net/josumosomiralov.pdf
    • http://xiwakaravivomik.scienceontheweb.net/2454893135.pdf
    • http://zesenadozefut.sportsontheweb.net/25630106650.pdf
    • http://xafesuvorolivig.scienceontheweb.net/what_is_the_difference_between_crochet_hooks.pdf
    • http://sowopezamiw.medianewsonline.com/masterpieces_of_african_american_literature.pdf
    • http://lutefadeba.scienceontheweb.net/tablatura_bohemian_rhapsody_guitarra.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7f3bdb00-69da-475f-9a2d-604ee234670e/32401119862.pdf
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_c44507d9252d4fc48e841d30ad105d2a.pdf?index=true
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_060e70e9c16e472db0cea91f8cea563c.pdf?index=true
    • http://mozaninukokefef.onlinewebshop.net/insulin_function.pdf
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_3ad4ce53eff1463eaa3aafcf3eb1fa45.pdf?index=true
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_87d85e694a84427bb12cc8e5edaed68b.pdf?index=true
    • http://dopovis.myartsonline.com/ages_and_stages_questionnaire_24_months.pdf
    • https://uploads.strikinglycdn.com/files/44feab90-e432-4b9d-b949-88bd35082820/algebra_2_common_core_test_1_answers.pdf
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_118ef11fc97445d1a1ec014a6f22bc6b.pdf?index=true
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_1088a3b69b49422a867fbe8cbe57332b.pdf?index=true
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_72a3b4cf69c34aaba11e268be0945724.pdf?index=true
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_5071f51c7fdc487ea3c52043f6668ef7.pdf?index=true
    • http://pizitibasowu.atwebpages.com/xubobiromaxa.pdf
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_2f2a211a0d5f479886c8f6dce1c7d6b8.pdf?index=true
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_960ffbffa2c54da09511f7c35adf4fe9.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010409.bin
e2871f746d335ce8c788c95dfbef08f623a3d261b0e509acd35fe07c3e8f0af2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10409 5360 bytes
font_01_sfnt_off00011642.bin
b09c3d11add33e2be19ac4e6399769f03de5641f4d7c3d1520d72baded57ab94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11642 11204 bytes

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