Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3d7b7a96a80e33…

MALICIOUS

PDF

76.2 KB Created: 2021-03-07 14:18:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c5f31bf1a247db4a022f9f9b25928b9d SHA-1: f3e17a2cb50c220fe9ef57267f18a462aa164557 SHA-256: fa3d7b7a96a80e331e5fd6eed2acff4dd70b189937c98825f3994e8c2721dade
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://soxebez.ru/wix?keyword=saugerties+central+school+district+superintendent PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416939/normal_60436bf48a1bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406168/normal_5fcb988cdd220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_6016d386d54f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368951/normal_601935c67f5e6.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/gjahdlm/gabijibefipogabo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486033/normal_60375115bfb72.pdfIn PDF document text
    • https://wovodolu.weebly.com/uploads/1/3/4/8/134861979/foxugaku-gemovidim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463543/normal_600004f436594.pdfIn PDF document text
    • https://mijevofere.weebly.com/uploads/1/3/1/6/131606011/novanelitado.pdfIn PDF document text
    • https://rezusoroporinon.weebly.com/uploads/1/3/2/6/132695427/dodusiw_vibup_vajizimab_wupafesit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419452/normal_5ffc00c6c2eed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_5fe8ff405f47c.pdfIn PDF document text
    • https://cdn.sqhk.co/perokokamosa/jhgPgif/worldremit_top_up_fiji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504554/normal_600daf0f4ac65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377381/normal_5fc6e00dac2e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489058/normal_5fc83047d602d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476768/normal_600dd716d6a82.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvopone/hb1ZhfB/build_tower_defense_games_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460465/normal_602fd93761538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384045/normal_600da1ba5e011.pdfIn PDF document text
    • https://cdn.sqhk.co/pijajawopoji/dgeQije/sugujujebazabazisiso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427287/normal_5ffcad574f54b.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://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_4fc5440c43094257a34324a94b4a40e0.pdf?index=trueIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_d3c3c6f449884ca7bb681ccd06d01f4b.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_52321a2109444dd1b0245c1e42cca73a.pdf?index=trueIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_9faee338ad4b45df90e5c99ea74215f9.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_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 5320 bytes
SHA-256: 64847a9e7012ac4955c861fde9317883e0617745277a60b6bc955544222ce9f6
font_01_sfnt_off0000eff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 10564 bytes
SHA-256: 73f5b6a4ed2aaac2ec9b94c26c2876e032ad2c9b779febc9922dab972faeb258
font_02_sfnt_off000113f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F5 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34