Malicious PDF — malware analysis report

Static analysis result for SHA-256 9683fa3f8f070725…

MALICIOUS

PDF

73.9 KB Created: 2021-03-22 09:54:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 440786047404961e47c6965f42d6d591 SHA-1: d04b9998cb4c4646b0d7c6c0d7300054c7c3f378 SHA-256: 9683fa3f8f0707251a6ed768b3e4365425e41481f6984965305015214d678664
194 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to obscure malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a likely attempt to redirect users to malicious content, potentially through embedded JavaScript or by exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://cdn-cms.f-static.net/uploads/4445343/normal_600e610318b37.pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4464065/normal_5fdf53f356007.pdfIn PDF document text
    • https://kodopikowi.weebly.com/uploads/1/3/4/6/134659436/2706147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483103/normal_6049240bdece0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446496/normal_5ff9cff480f48.pdfIn PDF document text
    • http://sarixibi.iblogger.org/stock_market_basics.pdfIn PDF document text
    • https://tiruzezisuwef.weebly.com/uploads/1/3/4/4/134499189/bixagavibipuborafeza.pdfIn PDF document text
    • https://sibetufubexab.weebly.com/uploads/1/3/2/7/132712005/4b1ae6b0a9a.pdfIn PDF document text
    • https://rirejanumaxix.weebly.com/uploads/1/3/4/6/134631236/1021095.pdfIn PDF document text
    • http://naropiwazufilu.22web.org/gorebesugadewep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374986/normal_5fe54dcc18449.pdfIn PDF document text
    • https://kazajibabagak.weebly.com/uploads/1/3/4/4/134467412/kezanelabalom.pdfIn PDF document text
    • https://vuledojovux.weebly.com/uploads/1/3/5/9/135962602/7166568.pdfIn PDF document text
    • https://fafapiponuge.weebly.com/uploads/1/3/4/6/134692005/f1ed1b78f4.pdfIn PDF document text
    • https://fileduwefevara.weebly.com/uploads/1/3/4/3/134384607/xuvol_wejuzajevab_miguluxikek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/bVCGPfG74RQ/wb?keyword=twilight%20movie%20download%20free%20fullPDF link annotation
    • http://gajovab.epizy.com/98784714170.pdfIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_41eb8131df024bfe8517d6567b14490a.pdf?index=trueIn PDF document text
    • http://nefoxujegodusif.rf.gd/answering_service_of_richmond.pdfIn PDF document text
    • http://wivowutone.epizy.com/how_to_start_stihl_bg56c_blower.pdfIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_10c3d550ecbe4855869dc026b700caca.pdf?index=trueIn PDF document text
    • http://rusavuwirajul.rf.gd/xeriwupemipazoxag.pdfIn PDF document text
    • http://sidajewaset.epizy.com/lol_doll_house_toy_world.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_off0000e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 5244 bytes
SHA-256: 7562fceda77e756d63fcddfbc728e9fab31e02c5a98051cea9cb68ea7fdf32b1
font_01_sfnt_off0000f5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 10808 bytes
SHA-256: d0433caf664e642b2885a95680d58e99482be9269731b7a0a622f987fafacfab