Malicious PDF — malware analysis report

Static analysis result for SHA-256 69aaa0902e129e75…

MALICIOUS

PDF

103.2 KB Created: 2021-04-23 11:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cb6bb4b114417fb2e6124b679fe78b21 SHA-1: f9cc2c5a92b400ddf58cc2c7fc382c52bd3a7c2f SHA-256: 69aaa0902e129e758f3d38197624212727b45d2fbf9facf29eccc20c906b4d22
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, 'https://nipisod.ru/strik?utm_term=romeo+and+juliet+act+4+vocabulary+answers', is likely part of this scheme to drive traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=romeo+and+juliet+act+4+vocabulary+answers PDF link annotation
    • https://kosukanawator.weebly.com/uploads/1/3/5/3/135304621/9b563cbcb2.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/hgjfEja/pdf_annotator_free_portable.pdfIn PDF document text
    • https://rutobugexamaxip.weebly.com/uploads/1/3/4/5/134508198/bff27ac2af0dcea.pdfIn PDF document text
    • http://gopagafab.medianewsonline.com/33116467047.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/cHtibZs/transmission_repair_shops_in_birmingham_al.pdfIn PDF document text
    • https://xuvurabog.weebly.com/uploads/1/3/2/6/132696285/kaxibifob.pdfIn PDF document text
    • http://rijoginijamibeg.mypressonline.com/hanuman_chalisa_telugu_vignanam.pdfIn PDF document text
    • http://fuvidevifa.scienceontheweb.net/nijavopoka.pdfIn PDF document text
    • https://xejigidusulup.weebly.com/uploads/1/3/4/7/134730122/8798482.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_b2bf7e93f5aa4741905b819529e38e7d.pdf?index=trueIn PDF document text
    • http://titugol.atwebpages.com/can_the_razer_blackwidow_ultimate_2016_change_colors.pdfIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_d7d55972bb7d44da9181025c651444d2.pdf?index=trueIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_b76b7e89be19415f97a3cac8173f0df0.pdf?index=trueIn PDF document text
    • https://24976a62-ea59-4ca6-8500-d0bd08f9a094.filesusr.com/ugd/65a075_5e70316752b74d75abcb121dad153f79.pdf?index=trueIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_34a3664da1b648039d89763e0a97db86.pdf?index=trueIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_35089aa29a93441e85eb2c55262bfb11.pdf?index=trueIn PDF document text
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_55b687dc4caa4780865988b7341294ac.pdf?index=trueIn PDF document text
    • https://298c7861-702e-4dad-8e6b-798164301c36.filesusr.com/ugd/98adb1_cf0bd58b610b4459bfcc4e4239a2503a.pdf?index=trueIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_b8e94c92d2804329a55faa7a9ac8c34f.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_817c287dfb9d42c4b5a0526ef766c2e0.pdf?index=trueIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_8fae8be31f8142dca53a3df210587a2a.pdf?index=trueIn PDF document text
    • https://7d14b3fe-44ab-47f5-a5a4-fb5d7998febd.filesusr.com/ugd/ba499c_e55104fe3c394fd9b44ae2239c14fbf6.pdf?index=trueIn 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_off00015160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15160 5648 bytes
SHA-256: d6d330efd49ef039d2ecf331f4b66fca1e2f31d5e1358100b782496020d75ba5
font_01_sfnt_off000164a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164A3 12144 bytes
SHA-256: 19b3bdf9969c82003499a3311f3ecef9b6d4242821d0d90e66cc6c71081f7c0f

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