Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3fa730ccb0103d…

MALICIOUS

PDF

75.3 KB Created: 2021-04-02 15:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7ba9c794512a05a69a82f752a7ffaa37 SHA-1: 5933f2af6bf3ac4ef509ffd2a0b151d4429f3b9a SHA-256: 1e3fa730ccb0103d467b16bd592ec0597bdc08254f508a09bd86c4af919b70bb
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/award?keyword=convert+un+pdf+en+word+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458829/normal_603acf923f24c.pdfIn PDF document text
    • https://cdn.sqhk.co/lakabarobuk/jhidhcz/3927986630.pdfIn PDF document text
    • http://vkysnaya-eda.site/48808199296ysut7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449987/normal_5fc5711a3ea68.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/jgEFAQM/27800838218.pdfIn PDF document text
    • https://cdn.sqhk.co/vapiwibisa/jhiivhg/paromon.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/jsp9tia/60250006969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385011/normal_602f1a0201c0a.pdfIn PDF document text
    • http://wisitens.online/fakineluzawijekijutoonr4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424985/normal_6058a5085127a.pdfIn PDF document text
    • http://milktree.store/hcf-2_transmission_fluid_napaqwvem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494430/normal_603104cabec94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418399/normal_5ffd218ab96bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460466/normal_5fd7858a39061.pdfIn PDF document text
    • http://free-at.pro/cambridge_book_2_listening_test_2_answersuubzl.pdfIn PDF document text
    • http://konsalting.info/63725416462w52a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485939/normal_60158135c82aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_e08c8f782f1847d09f409daf5b327105.pdf?index=trueIn PDF document text
    • http://xotaxebotejij.rf.gd/lg_error_code_ch_29.pdfIn PDF document text
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_b47dadb9beea4fc48d4f7eec0da6fdff.pdf?index=trueIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_0fc6f906d2144c48aceaaec0f7d0f0eb.pdf?index=trueIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_ae97ecb549ed47fa8a1b0e37ec51634f.pdf?index=trueIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_3fa85d139d8f498da888b839fe845c1b.pdf?index=trueIn PDF document text
    • http://xutetutadipuvux.rf.gd/491140858.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 4672 bytes
SHA-256: 4f7b2eb06d4c3f08495ed05f044d5db01d0cb4f3bf093ee95513b2fb3cfd4f12
font_01_sfnt_off0000fb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 10572 bytes
SHA-256: 4d69c5a96dae66692dcd9985d284fdb6e938cc8efd1966cbf837b6095943541f