Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fa745d67d0f084…

MALICIOUS

PDF

71.3 KB Created: 2021-02-17 09:58:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f7e99ada3aef666c96f65fdc85f52c64 SHA-1: 26bc22e5054f732033a3d06ebdbdbdee0cae10d5 SHA-256: 16fa745d67d0f0846e6220560ec6fb0ec724b043a611b36b5377a5c5c3d93e22
226 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed for SEO manipulation or phishing. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to execute a command, a common tactic in social engineering attacks to bypass security measures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://baarspo.ru/strik?utm_term=why+is+my+talk+talk+internet+flashing+orange PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472481/normal_5fe8b9052ceb4.pdfIn PDF document text
    • https://dafubadam.weebly.com/uploads/1/3/0/8/130874240/9822820.pdfIn PDF document text
    • https://senorori.weebly.com/uploads/1/3/4/6/134641151/efc1f3c04cd60ed.pdfIn PDF document text
    • https://wuzijitegufizu.weebly.com/uploads/1/3/5/3/135320378/jijefezobifa_rolanofiviwu_dagon.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/nijepomu.pdfIn PDF document text
    • https://tuvopezape.weebly.com/uploads/1/3/4/7/134712323/kukuvakejevupomevi.pdfIn PDF document text
    • https://jozufibajas.weebly.com/uploads/1/3/0/9/130969385/retapug.pdfIn PDF document text
    • https://nazorokofewedu.weebly.com/uploads/1/3/2/7/132710677/biziwof.pdfIn PDF document text
    • https://rixodinek.weebly.com/uploads/1/3/5/3/135392020/5932226.pdfIn PDF document text
    • https://zanixikowupu.weebly.com/uploads/1/3/1/4/131437740/lekuwotibejow-gafud-komasenoj-nesaxipoxigikap.pdfIn PDF document text
    • https://turonobofudub.weebly.com/uploads/1/3/4/4/134463989/domivetaxitokepetib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489429/normal_5feb589a95c29.pdfIn PDF document text
    • https://feropozu.weebly.com/uploads/1/3/1/4/131454035/9648101.pdfIn PDF document text
    • https://kunejadisitezan.weebly.com/uploads/1/3/4/0/134096254/5a0df4503390.pdfIn PDF document text
    • https://jotafatebukuzeb.weebly.com/uploads/1/3/0/7/130776674/kuwetenilogabigutari.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dawozisi.rf.gd/93840382819.pdfIn PDF document text
    • http://zazedosipafefu.epizy.com/10511117775.pdfIn PDF document text
    • http://rilifufamorupud.epizy.com/37164591908.pdfIn PDF document text
    • http://pejonoma.epizy.com/nejagu.pdfIn PDF document text
    • http://mujigivufutufu.rf.gd/purutixikinibi.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_off0000d8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 5360 bytes
SHA-256: 4f4473d6193d3d5431a1d5b15f98d438ed0f268433d67ad0df003155c3ca1a90
font_01_sfnt_off0000eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 10848 bytes
SHA-256: a80cae091e863755f2f6d36eb5bff8521cfc2586cbd64dc15fb51f3dea75ef97