Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf18c76e1ca00c45…

MALICIOUS

PDF

82.5 KB Created: 2021-03-28 01:04:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1e782856405accc58043923b64620e82 SHA-1: 7cf765c256a2b8e1fb8dd52dd2989ed6f69e3b66 SHA-256: cf18c76e1ca00c452b99564e50c02ebc587222e2ab4cc0895bc8319a6fc14623
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

Heuristics 5

  • 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 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://zajinet.ru/award?keyword=becker+usmle+books+pdf PDF link annotation
    • https://cdn.sqhk.co/laruxibut/hoYw8tJ/69853551541.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463533/normal_5ff9bc3eb34f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_600cb60866c4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469358/normal_605d999ef1ae6.pdfIn PDF document text
    • http://zevibeponakat.getenjoyment.net/12990108133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377656/normal_604afa33632c6.pdfIn PDF document text
    • https://cdn.sqhk.co/lelogivotosu/hyZheMw/free_tools_to_check_website_performance.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_601cb743bfe38.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/ggwtpa9/super_adventure_mario_run_free_endless_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_6023809f68865.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/ritetemp_programmable_8022c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382627/normal_6024a87128a7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387230/normal_603a9795efb2d.pdfIn PDF document text
    • http://gizovivomiz.getenjoyment.net/potipaj.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
    • http://rigidafavubo.myartsonline.com/rozopoko.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/26478377042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f5df520-5c12-4006-bd7c-f62076c22890/what_is_sutton_hoo_famous_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf66dbda-c029-4705-9d0e-261efb8287c5/who_is_the_creepy_man_in_geralds_game.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/39058377579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd284bc-54fa-4f86-93ac-8b26d90f4aa6/english_syntactic_structures_flor_aarts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc77651-78d8-478a-8d95-9649c976b4ad/ge_fanuc_90_70_programming_software.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 4992 bytes
SHA-256: e9243f635c2b8b2418989a88b2e5dfe81e681232fea884f320373a7f4f3d963d
font_01_sfnt_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0001077c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 11272 bytes
SHA-256: 7951c7002a7bfd2c7b3652ca2621303a41c402c45cfaeea1fe60e4c23fe6eb8b
font_03_sfnt_off00012dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD3 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c