Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5bc2639e11a63e4…

MALICIOUS

PDF

85.0 KB Created: 2021-04-29 21:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f5d8521b702fd8797aa553339bdb09ba SHA-1: 749448803774417e7ebcf93bc53bcaf85f8cdca8 SHA-256: b5bc2639e11a63e43c7380ffc0222c1277b1db9b20b24378b2f4ac908d081ad8
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 pointing to disposable hosting, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, appears to reference a 'Utilitech pro' manual, likely a lure to entice users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=utilitech+pro+180-degree+2-head+led+manual PDF link annotation
    • https://pazonijozofax.weebly.com/uploads/1/3/1/6/131606668/wumusupemuw-nevusukiri.pdfIn PDF document text
    • http://suxewesawu.22web.org/77377396484.pdfIn PDF document text
    • https://cdn.sqhk.co/nozujeraguje/igEcgh9/61225717204.pdfIn PDF document text
    • https://cdn.sqhk.co/viwukepato/ltPggje/what_is_cuffing_season_yahoo_answers.pdfIn PDF document text
    • http://wigomufeze.22web.org/64298577586.pdfIn PDF document text
    • https://notaxivarem.weebly.com/uploads/1/3/4/6/134633458/7e5181c2a2c673.pdfIn PDF document text
    • https://womogidukiwu.weebly.com/uploads/1/3/4/8/134873304/4339421.pdfIn PDF document text
    • http://selizixid.iblogger.org/headway_elementary_video_worksheets.pdfIn PDF document text
    • https://rafunukogavukuj.weebly.com/uploads/1/3/3/9/133999746/sogufobajane.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_9271b9247c1440b6b8e5f6fd3591459a.pdf?index=trueIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_a95df5be63794f41a99d67543dddca89.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_b285ac6585e64fb4b135175ee96a561a.pdf?index=trueIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_cd82e15e8f6947f6b37dfcf34411bde6.pdf?index=trueIn PDF document text
    • https://5c54d0bb-9de8-469b-abb1-33232a952ba9.filesusr.com/ugd/370e3f_09ff25d6e3984d6992022a6b074e11e8.pdf?index=trueIn PDF document text
    • http://gipunixufekuto.epizy.com/caddx_nx_8_programming_manual.pdfIn PDF document text
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_f0b9cf3b47e94928acd37a476cfdda5d.pdf?index=trueIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_e3dc4f44080443d4a4e0410e67aed20a.pdf?index=trueIn PDF document text
    • https://502e425a-54a0-4661-a3e6-c6e116bdb13d.filesusr.com/ugd/10da26_0805645bed71438288438910ba92bd20.pdf?index=trueIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_180252838ce3447bb6667c1bce00d181.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_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 5852 bytes
SHA-256: 3ff934cb13b0b8e51ec4cd385ee4287cbf3463c6ec139f02792de51132a2809d
font_01_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 11544 bytes
SHA-256: 7748afd82202b8a83187d1b082dedc9078c0c45e13afad688160b1a9fcbab2a5