Malicious PDF — malware analysis report

Static analysis result for SHA-256 846f2d1102ca5e95…

MALICIOUS

PDF

82.7 KB Created: 2021-04-07 09:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b5ec3be2bbdea484c8e1806fa067a2d4 SHA-1: 51c465c8c04e449b909a89d444c19ba45673bc57 SHA-256: 846f2d1102ca5e95004480952caa1f7acf4e5280f30dd608eb029a4f5b8bb8ea
186 Risk Score

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 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=how+many+calories+in+subway+rye+bread PDF link annotation
    • https://golakabuzoved.weebly.com/uploads/1/3/4/8/134870140/bdc11e176.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425224/normal_5ff9d6f3cf02a.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/gogakasimudetub.pdfIn PDF document text
    • https://zunitaxipef.weebly.com/uploads/1/3/1/3/131398356/josubozatafefitorex.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/ODNibic/solovopivena.pdfIn PDF document text
    • https://cdn.sqhk.co/zorezikuluz/9hchbdx/51997506163.pdfIn PDF document text
    • https://wutowenejeboz.weebly.com/uploads/1/3/4/5/134599911/904974acb88702.pdfIn PDF document text
    • https://cdn.sqhk.co/zifakepavax/ji7Umhj/kavofin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460230/normal_5ffc16bf57de3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_b7569ea39984496bbccc7f5808c8b72a.pdf?index=trueIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_94e00d1b812a4260b1d89d1040c90c63.pdf?index=trueIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_d55b843948c346409215737bab00835e.pdf?index=trueIn PDF document text
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_d00a30e1d3104d0ebefe413baa2c09e3.pdf?index=trueIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_d7013c1bee7b42f08de819816b88a548.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/784e75e5-b4d1-4c5d-b3d3-c710577e730b/71531137838.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_b64c72b7f6f34963b2352cfd3325f161.pdf?index=trueIn PDF document text
    • https://d23eb412-52e1-45ef-a32a-0c032022daee.filesusr.com/ugd/03485a_6d45c8746fcb45668b332378a48a7cc7.pdf?index=trueIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_f863cfd56d5d490ba3d441087675a111.pdf?index=trueIn PDF document text
    • https://4228e3e8-6e56-436b-9c2a-5710a6c3a216.filesusr.com/ugd/e32dc8_671a774e73f5488aa6ef54989318c46a.pdf?index=trueIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_80608961a86946449e62324d910bcc8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bfbf299-1ee8-49b5-b27d-2d39a7886608/kenog.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 5380 bytes
SHA-256: 6ff994f8e24a7faeeeb21ee1438af8a0edfb2e521d2fcdc6dc2b3af3a51d6729
font_01_sfnt_off0001142e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142E 11892 bytes
SHA-256: 2c9c42257de6f3d348633e30ae06b59780bdc7a7c3d697097a9d2a830ddd1a9b