Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a085b3ecdc35672…

MALICIOUS

PDF

94.2 KB Created: 2021-03-26 07:54:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4488f073f9e24497597dc760a09f473d SHA-1: b358a109aa14f75eb477f4fe492a00aa7aad888d SHA-256: 0a085b3ecdc35672a039944635a26f147831daa3e935139be6e8609c1c94121a
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 0.9996

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://jottigo.ru/wix?keyword=sample+letter+of+extension+of+contract+for+seafarers PDF link annotation
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/db7960f479037b2.pdfIn PDF document text
    • http://forsage.pw/mosudowubx0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454984/normal_5ff8719de9e83.pdfIn PDF document text
    • http://shortsomfj.space/63135000270o8udy.pdfIn PDF document text
    • https://diwopasod.weebly.com/uploads/1/3/4/4/134475510/mokixinam_tebuxugunukofu.pdfIn PDF document text
    • https://pijutizomi.weebly.com/uploads/1/3/4/6/134686964/vuboxoxov-fofokijezesiju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419826/normal_605a69c60c595.pdfIn PDF document text
    • http://glossywp.online/577430551760y5u9.pdfIn PDF document text
    • https://tidepobowajaxuk.weebly.com/uploads/1/3/0/8/130814761/naxoxizesonof.pdfIn PDF document text
    • https://fosozenasavo.weebly.com/uploads/1/3/4/8/134889966/kuwam-semosivu-ganazedi-suwaza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_5f6ef90535cd47e7a3b4551d12675de4.pdf?index=trueIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_43c270a44872464799bf03e3de8893db.pdf?index=trueIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_51c271a9459d44708fa10fb0f430236f.pdf?index=trueIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_365ef77e96594dc79511d9a411ff0c8b.pdf?index=trueIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_009751b04e944d08a326602af87ad5d2.pdf?index=trueIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_99bdafa220054f1084ca17caa361bb13.pdf?index=trueIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_9afc2b5e5dd542f387064b7193783204.pdf?index=trueIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_f85b2cb5a58547799df5de7e610a32e6.pdf?index=trueIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_465bee2ffceb4b6b826d8d88f1e52850.pdf?index=trueIn PDF document text
    • https://b42dfab6-8227-42c4-8fe5-fc04d9433513.filesusr.com/ugd/a9a8df_db37c9ec8aa34b51a01a246a5b3fc642.pdf?index=trueIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_07e3e65629c1477c9da88e52f5835407.pdf?index=trueIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_a2e0fcaf46e94035a0e843040856cecb.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_off00013013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13013 5332 bytes
SHA-256: 1e30cd16387fc0ed9bc81b00df9be67ff8bb7b702a5f3de7005956c3d27ba324
font_01_sfnt_off00014224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14224 12096 bytes
SHA-256: 3acc83b5b830d5b149995a1f013a51de1881dfc5eeaa99be7ef113de2fb5a64e