Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9e2ea54609a91d…

MALICIOUS

PDF

73.9 KB Created: 2021-04-04 09:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cbb21d84d811ee1e0983f67c437aead4 SHA-1: 88bd9d956796d30fcd8457173cd9809fc300dd73 SHA-256: 8c9e2ea54609a91da03fd5eae48e86c73be411b29f7bec95ef8210b0a6bdb7ad
156 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 0.9997

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
  • 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.
  • 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://dafemum.ru/wix?keyword=guided+reading+activity+12-1+northern+europe+answers PDF link annotation
    • http://arnautmebel.ru/fundamentals_of_python_first_programs_downloadub6ng.pdfIn PDF document text
    • http://vbnmcxz.xyz/which_graco_double_stroller_is_bestlqqfa.pdfIn PDF document text
    • http://mexicotop.xyz/23939503997ld9sb.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://s3.amazonaws.com/faluzotixupi/telephone_number_for_equifax_credit_reporting.pdfIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_1c0453499b9e4ec89a5cee2a49181b07.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/tesla_model_3_mid_range_increase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c1fa36e-dc87-4024-be9a-7f6b4d785491/18679294238.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_eeb79ea1b7f54dfc8cd83e12c01f74d8.pdf?index=trueIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_592f529d951c4cd9ad68b9c7564185e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tumasun/61652957172.pdfIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_0881f9ec5a2b4452872bd0fabe219a63.pdf?index=trueIn PDF document text
    • https://aaa8450b-5959-4376-bf95-5e5e4b45aab3.filesusr.com/ugd/bcfc74_3ecdbe89fd7a4735b35aea18b5f5b033.pdf?index=trueIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_2bd2cc74fd1c4f9a9781ab5ac072b7ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/37533174833.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/how_to_write_a_copywriting_brief.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73168218-fea2-43da-8f42-aa136fb95c80/xarutekapiluboruj.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_abb504f39680419ea080cf0b75d94e4d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff68bd3-fdb3-454a-a117-a70b03cb2f66/34105364912.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/touhou_antinomy_of_common_flowers.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/replace_new_transfer_belt_samsung_c480fw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD506 5684 bytes
SHA-256: 6b1d84d28c132199d1a485a5fcb55c23a0c4100dd9c50a312942e747350e5a04
font_01_sfnt_off0000e880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE880 10376 bytes
SHA-256: 8f5f23d963bfc698e38417942c186788a656f6ca485c0800b34f342e7f6f90d2
font_02_sfnt_off00010bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD5 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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