Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf010975cfc3a33…

MALICIOUS

PDF

73.2 KB Created: 2021-04-10 07:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6cbb5b9566ee8b8222695e50dc27c7f SHA-1: 6113195c825a1dbe3fa389d873cd12800b11743f SHA-256: eaf010975cfc3a33e5844e79189a58d9ea23813061865568fc26bc25b0cbcb67
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The primary URL, https://maypoin.ru/strik, is likely part of a malicious redirection chain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://maypoin.ru/strik?utm_term=what+is+computer+programming+and+why+is+it+important
    • https://cdn-cms.f-static.net/uploads/4477910/normal_5fe7d78ded35d.pdf
    • https://static.s123-cdn-static.com/uploads/4404310/normal_5ff08f72636f9.pdf
    • https://cdn-cms.f-static.net/uploads/4460076/normal_5fe747171a0a8.pdf
    • https://jamudavepavu.weebly.com/uploads/1/3/5/3/135324372/9326657.pdf
    • https://sonatovixafu.weebly.com/uploads/1/3/1/8/131871956/fbea6d.pdf
    • https://dazuzidasepod.weebly.com/uploads/1/3/2/6/132681566/rabivenikuwif_bepuduro.pdf
    • https://static.s123-cdn-static.com/uploads/4448121/normal_5ffd3b1aa5b31.pdf
    • https://cdn.sqhk.co/ruduligived/8u1id9B/best_app_to_read_blogs_on_android.pdf
    • https://kumajevebak.weebly.com/uploads/1/3/1/8/131856027/1ed6d.pdf
    • https://cdn.sqhk.co/ketegobuto/bhenBjj/vector_definition_data_science.pdf
    • https://vepimogarib.weebly.com/uploads/1/3/4/8/134856589/2578252.pdf
    • https://mixajogidevo.weebly.com/uploads/1/3/0/9/130969427/watemuv-zifobatomepij.pdf
    • https://cdn.sqhk.co/kivipemo/CFgdiND/wobokosomapodotiw.pdf
    • https://dowevatubewud.weebly.com/uploads/1/3/4/9/134901186/6235636.pdf
    • https://nupigefaxobabu.weebly.com/uploads/1/3/1/0/131070289/6123faf08.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ac840d52-a059-43af-b0f6-070b1a72d584/59017386511.pdf
    • https://uploads.strikinglycdn.com/files/b57f53bd-bbbc-45de-abe7-67dc9c4c0521/zutud.pdf
    • https://s3.amazonaws.com/gonasidupij/ap_art_concentration_ideas_photography.pdf
    • https://s3.amazonaws.com/musokejixami/auto_send_hearts_tsum_tsum_android.pdf
    • https://uploads.strikinglycdn.com/files/0fc326d8-6415-49bc-9db1-10d2bde90ad5/temukudizutunudijor.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d42a.bin
66ffa26bbba9007e4cd55fba39633ec1597fc78f6abd8553df210dd037d1fa48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD42A 5544 bytes
font_01_sfnt_off0000e6ef.bin
0ac8b97a9ea2dc96105d2f43db304f620ef81a70cd1cdec1c8fb7bcacfc5d7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 9884 bytes
font_02_sfnt_off000108bc.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 4324 bytes

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