Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e932e053153bce…

MALICIOUS

PDF

87.2 KB Created: 2021-03-20 22:58:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbc2a8010def51d0add4f61b62fed68e SHA-1: 7c4958cf792d8d8bcd8a77bd3c860819424833d2 SHA-256: f8e932e053153bcee46c8de56b6533a0104370eeb5d605e9ea08744dc0a17cde
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM finding and ClamAV detection as Pdf.Phishing.Trojan. The presence of numerous external links, including one to 'vilenefex.ru', suggests a phishing or malware distribution attempt. The ML classifier output of 0.999704 further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://vilenefex.ru/award?keyword=alphago+zero+nature+paper+pdf
    • http://helplnstagramcontact6088758.com/kevarogulotdpkck.pdf
    • https://cdn-cms.f-static.net/uploads/4388293/normal_603c1764b49b6.pdf
    • http://free-at.pro/tv_guide_austin_texas6wwpq.pdf
    • http://balifruit.com/20929254809tyyaa.pdf
    • http://swast-group.website/independent_commission_against_corruption_act_19882ed8i.pdf
    • https://cdn-cms.f-static.net/uploads/4467030/normal_604169601616c.pdf
    • http://itgermany.net/fawadm2o3n.pdf
    • https://zurejekivob.weebly.com/uploads/1/3/0/8/130813755/vonagix-jopomuwapekubor.pdf
    • https://static.s123-cdn-static.com/uploads/4491671/normal_60047c0d96a0b.pdf
    • https://rasozonikazip.weebly.com/uploads/1/3/4/9/134904665/8772307.pdf
    • http://mattelipsticks.site/2550724247807280.pdf
    • https://waperimawomexav.weebly.com/uploads/1/3/4/7/134733778/2489950.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_33a3fbd7b33f44979903942fd45225d7.pdf?index=true
    • https://s3.amazonaws.com/gudukupir/ielts_reading_answer_sheet_2019.pdf
    • https://s3.amazonaws.com/dazemi/28931743654.pdf
    • https://s3.amazonaws.com/xidulumexi/nodusaf.pdf
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_c492cc0807d04c92b08b68771dd6ccb3.pdf?index=true
    • https://b760d8db-9746-4821-aa2b-94c9f806d328.filesusr.com/ugd/26ce45_bade6fff13d4410cb90283841c5385ff.pdf?index=true
    • https://s3.amazonaws.com/bisapovepizaj/windows_powershell_3.0_step_by_step_free_download.pdf
    • https://s3.amazonaws.com/zunaduxa/android_activity_lifecycle_explained.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_off0000fa87.bin
366bde5794d0b18ddc851b4ad02c706ddf3a53ef6b384a097712dde898402847		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 8508 bytes
font_01_sfnt_off000116fc.bin
fb2f74af1d1000fd7eee6ceccd12a6018c86bff6425cc9c63b9acaf9370e0c8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116FC 5164 bytes
font_02_sfnt_off00012890.bin
ccd3ef47095d7395db4a2334a408b8811b368221e7ea8462369989ad8d6542bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12890 11484 bytes

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