Malicious PDF — malware analysis report

Static analysis result for SHA-256 4241edf3473d973b…

MALICIOUS

PDF

187.3 KB Created: 2021-04-27 10:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: abad2d14c0d07927e6c9cd9b49bacac9 SHA-1: 23865487d814d51326a2210e62924e524e59b911 SHA-256: 4241edf3473d973b25fd62f3566c103eaa2d0487b31b3806ebe95875a6e45822
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were directly extracted, the PDF structure and the presence of external URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pelibifir.ru/strik?utm_term=minghu+wetland+park+%252F+turenscape PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368219/normal_5ff5d0b079da5.pdfIn PDF document text
    • https://tozusasulinun.weebly.com/uploads/1/3/4/8/134872335/silajisofodozew.pdfIn PDF document text
    • https://mijawogutudegi.weebly.com/uploads/1/3/4/3/134374589/3fc34.pdfIn PDF document text
    • https://tiwixuferexo.weebly.com/uploads/1/3/1/3/131380596/jawos-ruxibelo.pdfIn PDF document text
    • https://cdn.sqhk.co/xisalaximel/rifjeYR/35941184364.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/Mgfwpo9/dabupimebujokirimizekuwet.pdfIn PDF document text
    • https://waperimawomexav.weebly.com/uploads/1/3/4/7/134733778/pewipaxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449769/normal_5feccfbb7063e.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://uploads.strikinglycdn.com/files/e6b7df39-14ec-45dc-a645-dad33bf02b59/rezozavekutegozukakebe.pdfIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_06e5342d72a646c8bee1399566db87f4.pdf?index=trueIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_3803e93bb5974646ab9a08a8484362ee.pdf?index=trueIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_63def3db17a4425695b70e79e0e516f6.pdf?index=trueIn PDF document text
    • https://229c0a76-8cd2-4a6d-ad64-a548a1436bbb.filesusr.com/ugd/f9ed01_7c452e4f3262479395c0795533533393.pdf?index=trueIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_403f0ff4b4064e58b47ad64c23489ae0.pdf?index=trueIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_719fc75bd1384d4a9dadaf08519b9f18.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3375d5f4-d2b1-47dc-89ff-d841e0cee24b/shade_of_vampire_92.pdfIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_19cfd857d0384ce693560acfe281a71c.pdf?index=trueIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_f3c61ab520724ad4a60df60d2de54792.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/029f0c80-27dc-42fc-8d00-a3252e1af129/59761423605.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_off0000f3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 143752 bytes
SHA-256: 303b412ddcc798d059d2a372357e7da56522e23867265b39a046d66167a41fce
font_01_sfnt_off00029bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29BBF 5304 bytes
SHA-256: 214aa4aaadcf734bab76c57852e13fd4771a27a478909a0a1aacf555d3578628
font_02_sfnt_off0002add9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ADD9 10472 bytes
SHA-256: 12c4c85145aa04ee59aa881d781147030b170003855733e7120b6fdbc6ee15b3
font_03_sfnt_off0002d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D128 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34