Malicious PDF — malware analysis report

Static analysis result for SHA-256 23047f6165c98f75…

MALICIOUS

PDF

78.8 KB Created: 2021-03-31 04:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c54f243fb2555b11bf7af3dd89de4bf8 SHA-1: c9eb260b84b34f5f6d8428a1f1c8f5044e99f2d7 SHA-256: 23047f6165c98f7549ad625d199663b6410de9af88fe9b96b4c7170f5c1e549e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://resalured.ru/strik?utm_term=list+of+critical+equipment+onboard+ship PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494669/normal_6001ec19481a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369796/normal_5fe1d09e324dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416316/normal_6021f7975fcf7.pdfIn PDF document text
    • https://mirajaxudedina.weebly.com/uploads/1/3/0/7/130775596/jituvejemuze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410433/normal_6029f3aac754f.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/very_loud_ringtones_free_download_for_iphonec1xrp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_6063bd86d4630.pdfIn PDF document text
    • http://optamorem.com/how_to_apply_swiffer_wet_jet_padsxas08.pdfIn PDF document text
    • http://telgrm.site/zepiv2otjb.pdfIn PDF document text
    • http://bred-enligne.com/mozilla_firefox_android_tv_apkpergu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386607/normal_603df809a1327.pdfIn PDF document text
    • https://mugokirupela.weebly.com/uploads/1/3/2/6/132681863/2331460.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_5ff1d98f65027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383680/normal_603f500910ca5.pdfIn PDF document text
    • https://wetebofi.weebly.com/uploads/1/3/1/6/131608016/susija.pdfIn PDF document text
    • https://kofivenemiwelew.weebly.com/uploads/1/3/1/3/131380814/nuvufoxinexoroxik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445119/normal_602b28342c40d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_0d0c14ed7f694a7d883cdc60b49fcce4.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_da98320b5fc34c268967408c259d58b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd7741e-4bba-4a13-abbd-0ef43acbcff2/9028705292.pdfIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_38a97b9593534dcfa6d5c023f34e2853.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46555564-c525-4d3a-9933-b6d33b9d02fd/50904198154.pdfIn PDF document text
    • https://64e1471b-64f8-4582-b127-b1692805dd1b.filesusr.com/ugd/507a3d_9f647ef0157b4b5b9fa6cb48b7d2fa02.pdf?index=trueIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_01ee2edcc0c843129fa5d219187dec3a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f22d622-3de4-49a2-9c46-8ef70a4db992/48441419244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee8d18ba-d0f6-456a-a373-e05b3be1c9a5/sezitusabezux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b63a4894-cef2-4c77-bed7-8d903bc5f933/42975705361.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_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 5604 bytes
SHA-256: c29b3174550260f23eea106dbd693f40af383ed9b87eec26b2ddabf67849e472
font_01_sfnt_off00010958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10958 10624 bytes
SHA-256: 01eb51b6a4f653f6a5a20d686dbf1bb51449f2ec10282a95b3823714551a6fd9