Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90d1483e169baff…

MALICIOUS

PDF

84.8 KB Created: 2021-03-16 03:22:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 93eeddf74dc344380f0b4b4fd827adb4 SHA-1: a2297d85c2226015bd008f9cd87b9cc19107a6d8 SHA-256: d90d1483e169baffa01b283a6f538abbfcbd4c8104be33ea6a4f5d20b076203a
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 0.9990

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://dugedepap.ru/strik?utm_term=mcculloch+pro+mac+610+chainsaw+parts+diagram PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445879/normal_5fe83e58d2bb6.pdfIn PDF document text
    • https://pafukonogoxaxe.weebly.com/uploads/1/3/1/4/131437157/xusixut_vuregi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485807/normal_602f5ffd162d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457876/normal_60265a03a5536.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390350/normal_5fefdf91f1446.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/3244810.pdfIn PDF document text
    • http://nebatomefov.scienceontheweb.net/2661865483.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/pimipetej_zezofosej_tegir_rulun.pdfIn PDF document text
    • https://kekoweditolig.weebly.com/uploads/1/3/2/6/132683085/nifipolima.pdfIn PDF document text
    • https://lojavexir.weebly.com/uploads/1/3/5/9/135963097/4515472.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376612/normal_5fcaf734e98a2.pdfIn PDF document text
    • https://zeniladafisu.weebly.com/uploads/1/3/5/3/135320186/3526736.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/bersa_thunder_380_grip_screws.pdfIn PDF document text
    • https://dinabowufijub.weebly.com/uploads/1/3/4/7/134751612/547b5b.pdfIn PDF document text
    • http://lukiduxipapep.mywebcommunity.org/accounting_101_cheat_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373240/normal_6019a0fcde3a2.pdfIn PDF document text
    • https://lofidebonejiniz.weebly.com/uploads/1/3/5/3/135334880/3701723.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5fff4eea23459.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://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_63bf8ec852ac47ed8f8ab87333239f6b.pdf?index=trueIn PDF document text
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_dcee1e08293342bca438d856bbe2dc4e.pdf?index=trueIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_428b1dd6b2a54d09a17467fd20a9ab2e.pdf?index=trueIn PDF document text
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_c366e6cf657342e782f2c7497e47de05.pdf?index=trueIn PDF document text
    • http://gixarewujedel.atwebpages.com/6775432660.pdfIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_c24340a387b748aa8b3642494f39ca31.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 5696 bytes
SHA-256: ab667617f9d537c34d847f6dc808faa3660818328b268c91743dce84104a88c3
font_01_sfnt_off00011169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11169 11152 bytes
SHA-256: 28f3a1ca9c0c5aa552e394fb993e22ee3ba27581c234f47252bbbc1dbe626a06
font_02_sfnt_off00013768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13768 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2