Malicious PDF — malware analysis report

Static analysis result for SHA-256 402088c3d276912c…

MALICIOUS

PDF

144.4 KB Created: 2021-04-22 00:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9f6403b9fa417f8f643e6919b2b8857b SHA-1: 281dde92f14e70b7c18f3f8e175fc4eb057f4071 SHA-256: 402088c3d276912c66992381487253174250bb8ef7a35e3fe780bede08844f08
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or redirection mechanism. One of the primary URLs, https://botokaw.ru/strik, is marked as unknown and is likely part of the malicious infrastructure. The document body, though heavily obfuscated, contains references to 'Original 1900 sears roebuck catalog' and 'wkhtmltopdf', indicating a potential lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://botokaw.ru/strik?utm_term=original+1900+sears+roebuck+catalog PDF link annotation
    • http://nozekem.iblogger.org/4th_amendment_of_bangladesh_constitution.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://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_35871b730229461e9905031772b67c87.pdf?index=trueIn PDF document text
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_0eb225dc9d8f40e09d6ffb8b9c3e53ea.pdf?index=trueIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_3034129f1fc947d6aea9557c4ba85f06.pdf?index=trueIn PDF document text
    • https://366cd995-4ddf-4220-a197-7cea849caf0e.filesusr.com/ugd/947062_14198b812e6645369112899bb31b5dc5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fddc6d21-7d0d-4651-9178-849b7472c55f/what_training_is_needed_to_be_a_real_estate_agent.pdfIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_6dfd0c2a32f14e978445b9871d06fc1e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sisaxu/xunivinezodifa.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/nizagiji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/477007ee-a0cc-45ae-9f9d-db655589791c/plan_y_programas_de_estudio_2011_secundaria_artes.pdfIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_c93a056e12384ed3b194738c391a07b6.pdf?index=trueIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_2bd98376d58041c882e7738f3dfab954.pdf?index=trueIn PDF document text
    • http://zefixufedinokas.epizy.com/69669236657.pdfIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_6add7454772b4350ac7ede6af36abd86.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/bootstrap_vue_form_group.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/huffy_womens_cruiser_bike_basket.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/40521302893.pdfIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_53ecb81e50c54778b81ce718b3761edc.pdf?index=trueIn PDF document text
    • http://gagonunanu.epizy.com/babemalujetowaf.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_off0001eb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB6E 5432 bytes
SHA-256: 3597103bc0726e77f33522cd8f82ca86d5c967b12a4b7bc5b1d4bcfb02f5f66a
font_01_sfnt_off0001fdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FDF7 11932 bytes
SHA-256: be8f95537e22cb5da12c0878f911d8920656e324bab541f4bf0a76275d171fbe
font_02_sfnt_off000225c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x225C1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

Open this report in the interactive analyzer, or submit your own file for analysis.